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<document id="FD1A2C01AEC895A6583C2A4391A021F1" ID-DOI="10.3897/zse.100.130288" ID-ZooBank="07A629AB-C1D1-45F3-995C-F114D8493685" ID-publisher-id="130288" URI-arpha="8A0EFEB2-4058-599D-B197-0CF03A2C00A8" URI-zoobank="http://zoobank.org/07A629AB-C1D1-45F3-995C-F114D8493685" XM.bibliography_approvedBy="admin" XM.materialsCitations_approvedBy="admin" article-type="research-article" checkinTime="1729780110607" checkinUser="pensoft" docAuthor="Wittmann, Karl J. &amp; Wirtz, Peter" docDate="2024" docId="AF25E5F788F05019B9FE33576ED635BE" docLanguage="en" docName="Zoosystematics and Evolution 100(4): 1431-1442" docOrigin="Zoosystematics and Evolution 100 (4)" docSource="https://zse.pensoft.net/article/130288/download/xml/" docStyle="DocumentStyle:PensoftTaxPub.0000.journal_article.generic" docStyleName="PensoftTaxPub.0000.journal_article.generic" docTitle="Ischiomysis proincisa Wittmann &amp; Wirtz, 2024, sp. nov." docType="treatment" docUuid="88373DD6-43B0-4198-89ED-12344B6F3717" docUuidSource="ZooBank" docVersion="2" dtd-version="3.0" lastPageNumber="1442" masterDocId="8A0EFEB24058599DB1970CF03A2C00A8" masterDocTitle="An update on the genus Ischiomysis with a description of I. proincisa sp. nov. (Crustacea, Mysida) from a sublittoral marine cave in the Gulf of Guinea (tropical E-Atlantic)" masterLastPageNumber="1442" masterPageNumber="1431" pageNumber="1431" updateTime="1729784783777" updateUser="admin">
<mods:mods id="758572CA281BE591BE9583ADC98B6CCC" xmlns:mods="http://www.loc.gov/mods/v3">
<mods:titleInfo id="8AB6E46746C61D17BDDE0B32A5A277F6">
<mods:title id="4167E4BA8AE4767334D5105D1E08A99E">An update on the genus Ischiomysis with a description of I. proincisa sp. nov. (Crustacea, Mysida) from a sublittoral marine cave in the Gulf of Guinea (tropical E-Atlantic)</mods:title>
</mods:titleInfo>
<mods:name id="15F917CD3C0380B3C67FB58450956C65" type="personal">
<mods:role id="44C02605CBFC64733F87553D7E0E3337">
<mods:roleTerm id="0B6BE5CBE53EEFCB0BC961D4094851E1">Author</mods:roleTerm>
</mods:role>
<mods:namePart id="2C97CE86EB21675E5C5DB2E327E18B43">Wittmann, Karl J.</mods:namePart>
<mods:nameIdentifier id="09E8E1ECAFADF392EF11DE2985A4692B" type="ORCID">0000-0003-1381-2588</mods:nameIdentifier>
<mods:affiliation id="0C5CFB305791AD06BFAADF4064F72230">Department of Environmental Health, Medical University of Vienna, Kinderspitalgasse 15, A- 1090 Vienna, Austria</mods:affiliation>
</mods:name>
<mods:name id="9DBC3D8A024CBFD1EA707FE2F7E64A17" type="personal">
<mods:role id="A9532E17D1B7D929AED2A8C5C6AFC99D">
<mods:roleTerm id="7562DF245974176FD0290150F9E0A2B2">Author</mods:roleTerm>
</mods:role>
<mods:namePart id="A9E8754F53F100D389E60AAA4764D67E">Wirtz, Peter</mods:namePart>
<mods:nameIdentifier id="84B93916B80698F6EBB930EA13185AB6" type="ORCID">0000-0003-3920-6228</mods:nameIdentifier>
<mods:affiliation id="8E0159C0EF5F8A4BB973235C0CCA6C1B">CCMAR — Center of Marine Sciences, University of Algarve, Campus de Gambelas, 8005 - 139, Faro, Portugal</mods:affiliation>
</mods:name>
<mods:typeOfResource id="9BA880B8FB2B7C20D9AE233136AEB43D">text</mods:typeOfResource>
<mods:relatedItem id="953A56CBC9D31A7EF58FDE0BC8ACA8BE" type="host">
<mods:titleInfo id="353C26DADDA809642B1FD82ED62242BD">
<mods:title id="F820DBE9A9CBF8F09B0E605EF4EFAD30">Zoosystematics and Evolution</mods:title>
</mods:titleInfo>
<mods:part id="8436B2B1B7C5548D29E4859A65E5D140">
<mods:date id="19551915BD85933403F28D4E67F7B7F9">2024</mods:date>
<mods:detail id="0210601848CB0351527FF6A770C590E6" type="pubDate">
<mods:number id="93B417338A2408E4180E2E1EFE57CD5F">2024-10-24</mods:number>
</mods:detail>
<mods:detail id="05712242171128E958B5B26F972928AB" type="volume">
<mods:number id="4A5ADD472FEAE91F8ADC928056D9A533">100</mods:number>
</mods:detail>
<mods:detail id="251DEBCA33A27FB6CBE2DA0517207F6F" type="issue">
<mods:number id="DFB1A39B70848A8A7B85B8D3DDD8D753">4</mods:number>
</mods:detail>
<mods:extent id="6C4E5D286E7589E0AFFBEF2EBA475943" unit="page">
<mods:start id="386955C72470A6D76C244F90A4EE7FFF">1431</mods:start>
<mods:end id="A5903A8A483661FFA047F4B5468420F7">1442</mods:end>
</mods:extent>
</mods:part>
</mods:relatedItem>
<mods:classification id="EF62E4990C6E22CCC53420D5C3F9D4EB">journal article</mods:classification>
<mods:identifier id="40FE4A102EA844C850CA9970CE8F76F0" type="DOI">10.3897/zse.100.130288</mods:identifier>
<mods:identifier id="DF9328E82C0C2BD35A37B91140706413" type="ZooBank">07A629AB-C1D1-45F3-995C-F114D8493685</mods:identifier>
</mods:mods>
<treatment id="AF25E5F788F05019B9FE33576ED635BE" ID-arpha="AF25E5F7-88F0-5019-B9FE-33576ED635BE" ID-zoobank="https://zoobank.org/88373DD6-43B0-4198-89ED-12344B6F3717" LSID="urn:lsid:zoobank.org:act:88373DD6-43B0-4198-89ED-12344B6F3717" LSID-ZBK="urn:lsid:zoobank.org:act:88373DD6-43B0-4198-89ED-12344B6F3717" httpUri="http://treatment.plazi.org/id/AF25E5F788F05019B9FE33576ED635BE">
<subSubSection id="ED3FA5EE91EE7FAC79430C485EA53553" type="nomenclature">
<paragraph id="FA022160F72F19E7AA6C4BFFA952CBD2">
<taxonomicName id="831645D415071414DA82BB69E3B542D0" authorityName="Wittmann &amp; Wirtz" authorityYear="2024" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="proincisa" status="sp. nov.">
<emphasis id="B7F0A8CAC19C57FF2210284213C5C6B1" italics="true">Ischiomysis proincisa</emphasis>
</taxonomicName>
<taxonomicNameLabel id="8F2089926DEDDD711BCBDA947D859EE0" rank="species">sp. nov.</taxonomicNameLabel>
</paragraph>
</subSubSection>
<subSubSection id="5C4C07CAB1A78852F1AA7ADB1CB8BFD4" type="description">
<paragraph id="F8CB7BF128CFFD335EE9FDC46831808C">
<figureCitation id="6FDFCA94FA979B52ADD763E6F62078B8" captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Habitus of Ischiomysis proincisa sp. nov.; holotype adult ♂ (BL 3.9 mm, A, B, D) and paratype adult ♀ (4.2 mm, C); A, B. Holotype in toto, lateral (A) and dorsal (B); C. Paratype in toto, dorsal; D. Cephalic region of holotype, ventral. A – D. Photos of fixed specimens, objects artificially separated from background, green coloring of objects artificial." figureDoi="10.3897/zse.100.130288.figure4" httpUri="https://binary.pensoft.net/fig/1160134">Figs 4</figureCitation>
,
<figureCitation id="7762D77A658DEA599B71AB44A02EFC71" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5</figureCitation>
,
<figureCitation id="2DD75E1D29D2784AB6B6DB87D8D3DA0B" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6</figureCitation>
,
<figureCitation id="AB4E479D7D95FC623D83E6E9B8D60A7F" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7</figureCitation>
,
<figureCitation id="F9CABE62982A08962B001C4895B92FAA" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8</figureCitation>
,
<figureCitation id="7C0F17236E8C128ECFB72F84AABF9A67" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Ischiomysis proincisa sp. nov.; paratype adult ♂ (BL 4.5 mm, A, B) and nauplioid larvae (C, D); A. Uropods, ventral; B. Telson and right scutellum paracaudale (sc), ventral; C. Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (a 1) and antenna (a 2); D. Tip of pleon in another nauplioid specimen. Panel (A) combined from two photos; A – D. Green coloring of objects artificial; B – D. Objects artificially separated from background." figureDoi="10.3897/zse.100.130288.figure9" httpUri="https://binary.pensoft.net/fig/1160139">9</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="SECID0ERMAE" type="type material">
<paragraph id="5C000F0F4AB85313F2DA27EB2C821259">
<heading id="CB7AB925A18CD410137817586B7DB0AC" reason="title">Type material.</heading>
</paragraph>
<paragraph id="CB45C44087DBC27E50F1C631FA705E94">
<materialsCitation id="EA3191BAB878109D8BE5DC8D60AEEDBC" collectedFrom="V-shaped (i. e. two branches) semi-dark marine cave with three diveable entrances, from small mysid swarms in darker lateral recesses" collectingDate="2002-08-28" collectingMethod="diver operated hand net" collectionCode="NHMW" collectorName="K. J. Wittmann" country="Sao Tome and Principe" county="Gulf of Guinea" elevation="19" latitude="-0.0091" location="off Ponta das Furnas" longLatPrecision="7" longitude="6.511" municipality="Ilheu das Rolas" specimenCode="CR-30447, CR-30448" specimenCount="7" specimenCount-female="1" specimenCount-male="3" typeStatus="holotype">
<collectingCountry id="1AFF8DC281C8896C5FD218B2F57896AC" name="Sao Tome and Principe">São Tomé</collectingCountry>
•
<typeStatus id="9193007CFA0964740D2889628D27376C" type="holotype">Holotype</typeStatus>
adult
<specimenCount id="4DF5DAAAB5F9AC721A695E3823633AAC" count="1" type="male">♂</specimenCount>
(
<abbrev id="ABBRID0EXMAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
<quantity id="31481C4BE5A608364CD61A05D9D6AE77" metricMagnitude="-3" metricUnit="m" metricValue="4.2" unit="mm" value="4.2">4.2 mm</quantity>
,
<named-content id="66210A15429FC0A6F75FAA9989CF91B7" content-type="dwc:institutional_code" xlink_href="http://grbio.org/institution/naturhistorisches-museum-wien-0" xlink_title="Natural History Museum of Vienna">
<collectionCode id="E670B245141CFD5A4854901DBB714D34" country="Austria" httpUri="http://grbio.org/cool/91g3-0mnw" name="Naturhistorisches Museum, Wien" type="Museum">NHMW</collectionCode>
</named-content>
-
<specimenCode id="39CB5F256CD9B21DA0A06C2F2C72767B">CR-30447</specimenCode>
), paratypes,
<specimenCount id="BE2B56F7A3E6BD5BEA1BCF733042887E" count="1" type="male">1 ♂</specimenCount>
ad. (
<abbrev id="ABBRID0EANAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
<quantity id="F96DF922F70F063BB82FE80B8E44A26F" metricMagnitude="-3" metricUnit="m" metricValue="3.7" unit="mm" value="3.7">3.7 mm</quantity>
),
<specimenCount id="299A17F93F5FA9A70FB41DE0253D01F1" count="1" type="male">1 ♂</specimenCount>
subad.,
<specimenCount id="8B77A41CD60A59785A50C3F31E8A6879" count="1" type="female">1 ♀</specimenCount>
subad.,
<specimenCount id="F586526AE311B55DBEB452B333D598CF" count="2" type="generic">2 imm.</specimenCount>
,
<specimenCount id="EB29D3CED9DD880FC53B3526E509879B" count="1" type="generic">1 juv.</specimenCount>
(
<named-content id="AE944BC55A20DBA102EBAC935A074FF8" content-type="dwc:institutional_code" xlink_href="http://grbio.org/institution/naturhistorisches-museum-wien-0" xlink_title="Natural History Museum of Vienna">
<collectionCode id="591B954FDEE24F21C297D0906FE525A7" country="Austria" httpUri="http://grbio.org/cool/91g3-0mnw" name="Naturhistorisches Museum, Wien" type="Museum">NHMW</collectionCode>
</named-content>
-
<specimenCode id="77081ED85DFE4139D46EB2853BF5A4C8">CR-30448</specimenCode>
); E-Atlantic,
<collectingCounty id="5FBB2F11C99F88245F174390963D43EB">Gulf of Guinea</collectingCounty>
,
<collectingMunicipality id="74328DDB7B1DB4FE2E9F8602BC530C97">Ilhéu das Rolas</collectingMunicipality>
(= small island crossed by the equator),
<location id="66541B8B02E0F89B2DBEED30F0BD2AC9" LSID="urn:lsid:plazi:treatment:AF25E5F788F05019B9FE33576ED635BE:66541B8B02E0F89B2DBEED30F0BD2AC9" country="Sao Tome and Principe" county="Gulf of Guinea" latitude="-0.0091" longLatPrecision="7" longitude="6.511" municipality="Ilheu das Rolas" name="off Ponta das Furnas">off Ponta das Furnas</location>
(= cape);
<named-content content-type="dwc:verbatimCoordinates" id="NCID0EMNAE" specific-use="{&quot;type&quot;:&quot;Point&quot;,&quot;coordinates&quot;:[6.511000,-0.009100]}">
<geoCoordinate id="B9709C613FD009C7A1814328467BB7F6" degrees="0.0091" direction="south" orientation="latitude" precision="5" value="-0.0091">0.0091 ° S</geoCoordinate>
,
<geoCoordinate id="9C0760247BBE51D84E398D8DD2DEBCF1" degrees="6.5110" direction="east" orientation="longitude" precision="5" value="6.511">6.5110 ° E</geoCoordinate>
</named-content>
;
<elevation id="7F367BA03C1C743C323DEA402B1DC854" metricMagnitude="1" metricUnit="m" metricValue="1.9" unit="m" value="19.0">
<quantity id="6B21985D6C6341914D88327E6DD82FD9" metricMagnitude="1" metricUnit="m" metricValue="1.9" unit="m" value="19.0">19 m</quantity>
depth
</elevation>
;
<date id="76E9F98ADBA0A2EEE9E9172504796894" value="2002-08-28">
<collectingDate id="306B15AC8F0D581595B12C5C0181CCC1" value="2002-08-28">28 Aug. 2002</collectingDate>
</date>
, 9: 50–10: 10 local time;
<collectorName id="1B18F891C592416C65A498CB58D8B34A">K. J. Wittmann</collectorName>
leg.;
<collectedFrom id="D4721041758CF98F09D5933B974C27E6">V-shaped (i. e. two branches) semi-dark marine cave with three diveable entrances, from small mysid swarms in darker lateral recesses</collectedFrom>
,
<collectingMethod id="8D6D73F106DC214664587FCA71E79A3E">diver operated hand net</collectingMethod>
</materialsCitation>
•
<materialsCitation id="6A57B89DD2497EAF28D76F947AC8B79C" collectedFrom="V-shaped (i. e. two branches) semi-dark marine cave with three diveable entrances, from small mysid swarms in darker lateral recesses" collectingDate="2002-08-22" collectingMethod="diver operated hand net" collectionCode="NHMW" collectorName="K. J. Wittmann" country="Guinea-Bissau" county="Gulf of Guinea" elevation="17" latitude="-0.0091" location="Holotype" longLatPrecision="7" longitude="6.511" municipality="Ilheu das Rolas" specimenCode="CR-30448" specimenCount="34" specimenCount-female="7" specimenCount-male="13" typeStatus="paratype">
<typeStatus id="62767E63FF1EF9B0746A717BACF42FEE" type="paratype">Paratypes</typeStatus>
,
<specimenCount id="34AC6B8564AC043EC35446398B30109C" count="3" type="female">3 ♀♀</specimenCount>
ad. (
<abbrev id="ABBRID0ERNAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.0–
<quantity id="1E8AF95D2B8EDC8EC8C986A5874356DC" metricMagnitude="-3" metricUnit="m" metricValue="4.3" unit="mm" value="4.3">4.3 mm</quantity>
),
<specimenCount id="F2D7FA081EDA5AC4399597BAC0F35279" count="13" type="male">13 ♂♂</specimenCount>
ad. (
<abbrev id="ABBRID0EVNAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
<quantity id="8F1805DEF88A5FDB869246F2FDEEDEAC" metricMagnitude="-3" metricUnit="m" metricValue="4.199999999999999" metricValueMax="4.6" metricValueMin="3.8" unit="mm" value="4.199999999999999" valueMax="4.6" valueMin="3.8">3.8–4.6 mm</quantity>
),
<specimenCount id="2CCF4A06C251C1116868C93EC8504638" count="4" type="female">4 ♀♀</specimenCount>
subad.,
<specimenCount id="9B08A36C5E1D9689041CDBA6843AA1FA" count="7" type="generic">7 imm.</specimenCount>
,
<specimenCount id="F7BAF10EFEF426320ECEACA0F4B32D49" count="7" type="generic">7 juv.</specimenCount>
(
<named-content id="0293355D1D1192333C0303BB29E6648C" content-type="dwc:institutional_code" xlink_href="http://grbio.org/institution/naturhistorisches-museum-wien-0" xlink_title="Natural History Museum of Vienna">
<collectionCode id="26CF77A1A55A0C9B8DDB3FC76CF32CB8" country="Austria" httpUri="http://grbio.org/cool/91g3-0mnw" name="Naturhistorisches Museum, Wien" type="Museum">NHMW</collectionCode>
</named-content>
-
<specimenCode id="A91AFCE2ED9F293CDC27E4DFCDCB5AC9">CR-30448</specimenCode>
);
<elevation id="0A06F5D876BD862C1CB89290509232CE" metricMagnitude="1" metricUnit="m" metricValue="1.7" unit="m" value="17.0">
<quantity id="A24AF4F493D12D5FD3D2E9507A31A070" metricMagnitude="1" metricUnit="m" metricValue="1.7" unit="m" value="17.0">17 m</quantity>
depth
</elevation>
;
<date id="4D6F3A2E2DB88C90DA666B66E97E34EF" value="2002-08-22">
<collectingDate id="8E0D5932CDAC6DEFFC102BCF41EF721D" value="2002-08-22">22 Aug. 2002</collectingDate>
</date>
, 15: 23–15: 50 local time; remaining data as for holotype
</materialsCitation>
.
</paragraph>
</subSubSection>
<subSubSection id="SECID0E5NAE" type="etymology">
<paragraph id="827AECDD3819EC7EF16A555036606BBA">
<heading id="68CF110267C502F3E71F64B2F8D1A19B" reason="title">Etymology.</heading>
</paragraph>
<paragraph id="D4FB0E6BF6378D01F4F040A1A71AA81F">
The species name is a Latin adjective with feminine ending, formed from the adjective
<emphasis id="63288ACA3EA39DDB453CD87891248321" italics="true">incisa</emphasis>
(incised) prefixed by the adverb
<emphasis id="34F046FB7B8A28EE62D479C2E08F7D7D" italics="true">pro</emphasis>
(anteriorly), referring to the apically incised rostrum.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EIOAE" type="type locality">
<paragraph id="95B9699DA832EF1868EB5F6017ED8B21">
<heading id="4EC2A6A41FA3F96C136C42FA1E9EE4CC" reason="title">Type locality.</heading>
</paragraph>
<paragraph id="B50CD4807A8D24BCB08757239A185030">
Off cape Ponta das Furnas,
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<geoCoordinate id="1A7742282494A6C5B8D717A7770AA464" degrees="0.0091" direction="south" orientation="latitude" precision="5" value="-0.0091">0.0091 ° S</geoCoordinate>
,
<geoCoordinate id="23375AC63B15A7A03F8601AEE028C767" degrees="6.5110" direction="east" orientation="longitude" precision="5" value="6.511">6.5110 ° E</geoCoordinate>
</named-content>
, in
<quantity id="FB7C51C8C84F7DF0F7DB2ABDEF770B90" metricMagnitude="1" metricUnit="m" metricValue="1.8" metricValueMax="1.9" metricValueMin="1.7" unit="m" value="18.0" valueMax="19.0" valueMin="17.0">17–19 m</quantity>
depth inside semi-dark marine cave. Each branch of the V-shaped cave is about
<quantity id="059C18212FAB091ED50A620A233F5F36" metricMagnitude="1" metricUnit="m" metricValue="3.0" unit="m" value="30.0">30 m</quantity>
long and open on both ends.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EWOAE" type="diagnosis">
<paragraph id="70CB4E96BEAC169EFE9A548AB8B2F20C">
<heading id="9A38978401A8B2CD855486DA832E3727" reason="title">Diagnosis.</heading>
</paragraph>
<paragraph id="08B5E7C0BF43226A76CB3640A263035D">
Based on adults of both sexes. Large calotte-shaped cornea (Fig.
<figureCitation id="F8DF3BF0F6A0C22BE949417C6AFE3465" captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Habitus of Ischiomysis proincisa sp. nov.; holotype adult ♂ (BL 3.9 mm, A, B, D) and paratype adult ♀ (4.2 mm, C); A, B. Holotype in toto, lateral (A) and dorsal (B); C. Paratype in toto, dorsal; D. Cephalic region of holotype, ventral. A – D. Photos of fixed specimens, objects artificially separated from background, green coloring of objects artificial." figureDoi="10.3897/zse.100.130288.figure4" httpUri="https://binary.pensoft.net/fig/1160134">4</figureCitation>
) occupies distal 2 / 3 of eye surface (half eye length in dorsal view); cornea diameter is 28–35 % carapace length. Rostrum trapezoid, anteriorly incised (Fig.
<figureCitation id="F0FA6654B24A26F0DD0FD1E71EAC0CEF" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 G</figureCitation>
), about as long as the terminal segment of the antennular trunk. Only the terminal segment of the antennular trunk near disto-mesial edge with obliquely forwards oriented subapically flagellate spine with handle ending in a tooth-like projection (Fig.
<figureCitation id="66D89255C173A90E1B055A31F94CFF7B" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 D</figureCitation>
); this spine opposed by a large smooth whip seta. Appendix masculina short though well developed, densely setose. Antennal scale (Fig.
<figureCitation id="19B0ABC86AFA11C42CA3126F0762B0AE" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 F</figureCitation>
) with small terminal segment separated by a not always distinct suture; scale reaching to the terminal margin of the antennular trunk; scale overreaching the antennal peduncle by 1 / 2 up to 2 / 3 of its length. Scale weakly bent laterally, slender; length is 4–5 times maximum width. Labrum (Fig.
<figureCitation id="FB5133C0961C99B23826B5155FE72261" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 I</figureCitation>
) with distally narrowly rounded, roughly triangular rostral protrusion. Both sexes with small median lobe on thoracic sternite 1, no median processes on sterna 2–8 (Fig.
<figureCitation id="EB4D72AC0CC8540A25A1703E9ED0F49D" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 E</figureCitation>
). Carpopropodus of thoracic endopods 1–8 with 2, 2, 2, 2, 3, 3, 3, and 3 segments (Fig.
<figureCitation id="153B573483428203503637792D4D8731" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 F, I, K</figureCitation>
, and Fig.
<figureCitation id="E6C9FF9FFDF31A5B04FB6A5F32DAFCA6" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 L, P</figureCitation>
). Length of carpopropodus 3 is 4.0–4.5 times maximum width; carpus and propodus separated by a distinct suture (Fig.
<figureCitation id="45FE26C11B00076BAAF9D98057BCD299" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 A, C</figureCitation>
). Carpus with 4 flagellate spines on distal fourth of its mesial margin in males (Fig.
<figureCitation id="2EB7D445B1A25F05183C25A5D9DC0A2D" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 B</figureCitation>
) versus 5 spines on distal third in females (Fig.
<figureCitation id="FBAA519134B1BCB7E2254321164775AB" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 D</figureCitation>
). Propodus without spines. Carpopropodus of endopod 4 (Fig.
<figureCitation id="DCF2C33B0EB7D260ECA06133E22C913F" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 K</figureCitation>
) with several simple smooth setae and 2–3 unilaterally barbed setae in two variants (Fig.
<figureCitation id="418D01C6649E5E36069DD128769AA555" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 L, M</figureCitation>
); claw almost straight, smooth, with bifid tip (Fig.
<figureCitation id="55DEEC7B85F1F1C7EA1C73582F16DCA5" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 G</figureCitation>
). Endopod 8 only in males with modified flagellate spine (Fig.
<figureCitation id="704990B23BE39B484D0198FCD9F7DCE1" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 M</figureCitation>
) on the outer margin of the ischium at one third ischium length from basis and an additional flagellate spine (Fig.
<figureCitation id="1DBBA990EACD5AD1D7B68E9F712C985E" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 N</figureCitation>
) basally on the inner margin; praeischium with a strong spiniform extension (Fig.
<figureCitation id="3B423F482B96C7C46E039BD183657770" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 O</figureCitation>
). Marsupium with large oostegite on thoracopods 7–8 plus a rudimentary plate on thoracopod 6. Penes tubular, terminally lobate (Fig.
<figureCitation id="4144F2F75ADC91EFD96526BE8ADBCE9F" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 E</figureCitation>
); length without lobes is 3.5 times width; penes half as long as ischium of endopod 8. Pleopods (Fig.
<figureCitation id="857691D1101390878D0BE1C08779814C" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8 E – K</figureCitation>
) rudimentary, unsegmented, setose in both sexes, no spines. Uropods (Fig.
<figureCitation id="6CF906353F1E417C363EAF54D8065A0D" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Ischiomysis proincisa sp. nov.; paratype adult ♂ (BL 4.5 mm, A, B) and nauplioid larvae (C, D); A. Uropods, ventral; B. Telson and right scutellum paracaudale (sc), ventral; C. Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (a 1) and antenna (a 2); D. Tip of pleon in another nauplioid specimen. Panel (A) combined from two photos; A – D. Green coloring of objects artificial; B – D. Objects artificially separated from background." figureDoi="10.3897/zse.100.130288.figure9" httpUri="https://binary.pensoft.net/fig/1160139">9 A</figureCitation>
) setose all around, no spines. Exopod extends 14–27 % its length beyond endopod and 28–44 % beyond telson. Telson (Fig.
<figureCitation id="5F8E6B988C14C13596AA289AB22F4E15" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Ischiomysis proincisa sp. nov.; paratype adult ♂ (BL 4.5 mm, A, B) and nauplioid larvae (C, D); A. Uropods, ventral; B. Telson and right scutellum paracaudale (sc), ventral; C. Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (a 1) and antenna (a 2); D. Tip of pleon in another nauplioid specimen. Panel (A) combined from two photos; A – D. Green coloring of objects artificial; B – D. Objects artificially separated from background." figureDoi="10.3897/zse.100.130288.figure9" httpUri="https://binary.pensoft.net/fig/1160139">9 B</figureCitation>
) length is 1.8–2.1 times maximum width and 1.0–1.2 times pleonite 6. Lateral margins with 13–18 spines only on distal half, not counting the apical spines. Telson with V-shaped narrow apical cleft penetrating 39–42 % telson length; cleft with total of 30–37 spine-like laminae along basal 45–53 % of its margins. Terminal lobes of telson each with two spines among which the disto-lateral spine is 14–15 % telson length; the disto-mesial spine 0.3–0.4 times length of the disto-lateral spine. Telson with total of 31–37 spines.
</paragraph>
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<paragraph id="9AD59CFAADBB70F6A3122B2CF3D46A1D">
<label id="3282FC2A471EEEFDFC33DA78C4D7A10C">Figure 4.</label>
</paragraph>
<paragraph id="CE5EF0EEACEF6FEC79D2CA92ED111593">
Habitus of
<taxonomicName id="3B2B203FDA88E47E1238DA849D07655B" authorityName="Wittmann &amp; Wirtz" authorityYear="2024" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="proincisa" status="sp. nov.">
<emphasis id="323383CC80188C8E6F21E2C2AA2A944A" italics="true">Ischiomysis proincisa</emphasis>
</taxonomicName>
<taxonomicNameLabel id="A70B63BF958A239F0AEC3CAD98DFB945" rank="species">sp. nov.</taxonomicNameLabel>
; holotype adult ♂ (
<abbrev id="ABBRID0EJSAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
3.9 mm,
<emphasis id="1EADADD6272659FEB46752A7B2C6034D" bold="true">A, B, D</emphasis>
) and paratype adult ♀ (4.2 mm,
<emphasis id="9EFEE2D2C973810AE58B48C78DCB62AA" bold="true">C</emphasis>
);
<emphasis id="73407D64ACC669C5D7A5274C4E5A5EA1" bold="true">A, B.</emphasis>
Holotype
<emphasis id="CDE095DDA97EF854F8A5C958131F14F9" italics="true">in toto</emphasis>
, lateral (A) and dorsal (B);
<emphasis id="4A1DBA466E4A37F85C216FCEE2AC697E" bold="true">C.</emphasis>
Paratype
<emphasis id="DC0991EEF69A0BFD7F2D22A32AA67747" italics="true">in toto</emphasis>
, dorsal;
<emphasis id="A75EAD41E00E66FF3A8135E3FC573040" bold="true">D.</emphasis>
Cephalic region of holotype, ventral.
<emphasis id="3FB0D11CC85A9C80634D6806FDE4C054" bold="true">A – D.</emphasis>
Photos of fixed specimens, objects artificially separated from background, green coloring of objects artificial.
</paragraph>
</caption>
<caption id="0F00279D1FCEA611124640A20683F8E3" ID-DOI="10.3897/zse.100.130288.figure5" ID-arpha="4CCFF251-F7AD-5C24-A3C3-016377EED758" httpUri="https://binary.pensoft.net/fig/1160135" startId="F5">
<paragraph id="F5771BF99B6F1025A04CC5C240030C8C">
<label id="A192DCD692516FC440DA00E3E8C7154C">Figure 5.</label>
</paragraph>
<paragraph id="6545D89B8C78B2990703AFCADA288F23">
<taxonomicName id="0611BF8834790C94C17B9E6C735A761B" authorityName="Wittmann &amp; Wirtz" authorityYear="2024" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="proincisa" status="sp. nov.">
<emphasis id="0839093924154B2BABC647014EBE7CF3" italics="true">Ischiomysis proincisa</emphasis>
</taxonomicName>
<taxonomicNameLabel id="C49CD4B6E650D6E61755436FBF86B4F4" rank="species">sp. nov.</taxonomicNameLabel>
, paratypes adult ♀ (
<abbrev id="ABBRID0EVTAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.3 mm,
<emphasis id="D72885CB686EE7A6AAFF331FA9857F2B" bold="true">A, E, I</emphasis>
) and adult ♂ (
<abbrev id="ABBRID0E2TAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.5 mm,
<emphasis id="FE9C4E6D7D90248463F7B9734D32F1B1" bold="true">B – D, F – H, J – K</emphasis>
);
<emphasis id="D91DA62DBDCF91AAD9DD15F54A54322E" bold="true">A.</emphasis>
Right female antennula with associated processes from the frons, dorsal;
<emphasis id="EA3732EC2B21C53EB08F022B1957CB5C" bold="true">B.</emphasis>
Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (
<emphasis id="52E4451D1D32C5C77F016F567AF1F0EE" bold="true">C</emphasis>
) and the disto-mesial flagellate spine (
<emphasis id="9490C77238CC3E65355D912AC1155590" bold="true">D</emphasis>
);
<emphasis id="8355336F10A70C54F3D50DF96AF8AF96" bold="true">E.</emphasis>
Disto-mesial flagellate spine from left female antennula, dorsal;
<emphasis id="80C62199DAC8CB7E333C0CD912DD4F92" bold="true">F.</emphasis>
Antenna with antennal gland, dorsal, many setae omitted from the antennal scale;
<emphasis id="E3868F190935C19871DA18E5BBB244A3" bold="true">G.</emphasis>
Carapace expanded on slide;
<emphasis id="6396F221F80734DA87DB94AF3150A95D" bold="true">H.</emphasis>
Detail of (
<emphasis id="0216BC5D067E84A29CC6FE60312FEBAF" bold="true">G</emphasis>
) showing posterior pore group, pore diameters not to scale;
<emphasis id="90242EDB8E5ECBA3763D865FB6781520" bold="true">I.</emphasis>
Labrum, aboral face;
<emphasis id="ADEB29179032B1D0F4C9D6F018234CB8" bold="true">J.</emphasis>
Labium, frontal face;
<emphasis id="743FD37506A31C798591CB570D083231" bold="true">K.</emphasis>
Maxillula, caudal.
</paragraph>
</caption>
<caption id="640FB5319F2C3126418FCCB3AA850DDC" ID-DOI="10.3897/zse.100.130288.figure6" ID-arpha="B9B3C0D7-5698-5AD0-9A33-7BCA458F7663" httpUri="https://binary.pensoft.net/fig/1160136" startId="F6">
<paragraph id="7AF20B9F665AAD85010D057A80D7B542">
<label id="F511814157670F6EDC2340D69CF81E8F">Figure 6.</label>
</paragraph>
<paragraph id="ABE9743BC50BD03E7AFEEE7A7B6F4849">
<taxonomicName id="2C97F543A024863371AD0ED9A4CF9D5F" authorityName="Wittmann &amp; Wirtz" authorityYear="2024" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="proincisa" status="sp. nov.">
<emphasis id="A37CD0559909CABF1B63E2E4C4F6CFAB" italics="true">Ischiomysis proincisa</emphasis>
</taxonomicName>
<taxonomicNameLabel id="AEB3253964871D5579D3638D472C799C" rank="species">sp. nov.</taxonomicNameLabel>
; paratypes adult ♀ (
<abbrev id="ABBRID0ERVAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.3 mm,
<emphasis id="5B27316D57A9CAE8D4CBF3C7CB26DA48" bold="true">A – D</emphasis>
) and adult ♂ (
<abbrev id="ABBRID0EXVAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.5 mm,
<emphasis id="75E7F3C75586DA169B6491376815B1B3" bold="true">E – M</emphasis>
);
<emphasis id="07385A2E575E6232B60E6F8BF6C5A669" bold="true">A.</emphasis>
Right mandible with palpus, caudal;
<emphasis id="01DC10705A3DE8356E4ECD5EE4C9754C" bold="true">B, C.</emphasis>
Masticatory parts of right (
<emphasis id="AB00385B07E2CCB50B618668A374A9D0" bold="true">B</emphasis>
) and left (
<emphasis id="4796E7063BBDD3CDDEF3D62B4EBF2F07" bold="true">C</emphasis>
) mandibles, caudal;
<emphasis id="5167B5A5397CFF3C295783D0AE8F0531" bold="true">D.</emphasis>
Maxillary palp, rostral;
<emphasis id="C341155C5D822352927691AE8C65CE88" bold="true">E.</emphasis>
Thoracic sternites 1–8 with penes, ventral;
<emphasis id="3C989992124F2B35401E8BEE3B58428F" bold="true">F.</emphasis>
Thoracic endopod 1 with part of coxa, caudal;
<emphasis id="AF29066B943169307D9460E27FAB337E" bold="true">G.</emphasis>
Detail of (F) showing dactylus 1 with claw, setae omitted;
<emphasis id="BC09AB83A0F25B4D42F1109F9E7E3FF3" bold="true">H.</emphasis>
Secondary detail of (F) showing claw 1;
<emphasis id="6FA07A626169430C9C058B5C9454146D" bold="true">I.</emphasis>
Thoracic endopod 2, rostral;
<emphasis id="B62F5E7F56BA350A08ED30E4128715AA" bold="true">J.</emphasis>
Detail of (I) showing dactylus 2 with claw, setae omitted;
<emphasis id="00B089E18717D3033765E8CD820234BE" bold="true">K.</emphasis>
Thoracic endopod 4 with basis (sympod), rostral;
<emphasis id="80751A98987B7940BD389C6D99C9D789" bold="true">L, M.</emphasis>
Details of (K) showing modified setae of the carpus (
<emphasis id="3259C3B6A2D5934C266FCEB9E0488531" bold="true">L</emphasis>
) and the propodus (
<emphasis id="80A864D7F934AC72DE4909DA1A905E43" bold="true">M</emphasis>
).
</paragraph>
</caption>
<caption id="A9FD06B084331E89E9659D8599778585" ID-DOI="10.3897/zse.100.130288.figure7" ID-arpha="FB9F2BF9-3D2F-55A2-B96B-08A1C73311A4" httpUri="https://binary.pensoft.net/fig/1160137" startId="F7">
<paragraph id="4C4B2F66CB92A24C2D54F98B166E6690">
<label id="92D9A937E34F8741E678B36F17A87D14">Figure 7.</label>
</paragraph>
<paragraph id="1A452C9A317306AC420B0444EDEC5103">
Thoracopods 3–8 in
<taxonomicName id="3BE9B76229866F1EDCFFB772E33EC1E9" authorityName="Wittmann &amp; Wirtz" authorityYear="2024" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="proincisa" status="sp. nov.">
<emphasis id="30B13FD63D6F00AA3592F79CBDAF3D01" italics="true">Ischiomysis proincisa</emphasis>
</taxonomicName>
<taxonomicNameLabel id="2823593991F1219EEAA3ED3B6CECFE4A" rank="species">sp. nov.</taxonomicNameLabel>
; paratypes adult ♂ (
<abbrev id="ABBRID0EZXAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.5 mm,
<emphasis id="197EA483F01B2FB1FBC4E57FCE7B55B5" bold="true">A, B, G – O</emphasis>
) and adult ♀ (
<abbrev id="ABBRID0E6XAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.3 mm,
<emphasis id="67A4C0C85E5FD771DE38994BE57CC7D0" bold="true">C – F, P – R</emphasis>
);
<emphasis id="F902B62DC131F8DB69A3BEA8431AE1D1" bold="true">A.</emphasis>
Male thoracic endopod 3, rostral; details (
<emphasis id="5670A5439CA876F0B9D8FFD6931890EA" bold="true">B</emphasis>
) show the flagellate spines of the carpus;
<emphasis id="DC547D7D33B7B120097AAC1CF61FA5A5" bold="true">C.</emphasis>
Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (
<emphasis id="B5B0A63105B75AE890BD2FED9145C2C3" bold="true">D</emphasis>
) and the disto-mesial carina of the merus (
<emphasis id="5B74A4446B93B1EAFE7240FB14AA1C13" bold="true">E</emphasis>
);
<emphasis id="1A31041E649E431826A7751721B6E6CF" bold="true">F – K.</emphasis>
Series of dactyli 3–8 with claw, setae omitted;
<emphasis id="C4B2941FE6BCC6E828056A8ADC35F485" bold="true">L.</emphasis>
Male thoracic endopod 8, caudal; details show the flagellate spines (
<emphasis id="E96459174EB48A5B87D140D1893D5BB0" bold="true">M, N</emphasis>
) of the ischium and the modified praeischium (
<emphasis id="2CF307DADE48DA87378F55F8B58504F6" bold="true">O</emphasis>
) with large tooth-like projection;
<emphasis id="64F72E6C2812312D9C22370A0135D616" bold="true">P.</emphasis>
Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (
<emphasis id="A5DFF19227CED31F029D2E4F3D2117EB" bold="true">Q</emphasis>
) of the ischium and a subapically flagellate whip seta (
<emphasis id="8796DFB5746AA833FFADDC204A38BD77" bold="true">R</emphasis>
) from the outer face of the oostegite.
</paragraph>
</caption>
<caption id="1A00CB0155A8141177B69C377AB1F6CF" ID-DOI="10.3897/zse.100.130288.figure8" ID-arpha="983F834C-6775-5D28-99C7-F525120A48C4" httpUri="https://binary.pensoft.net/fig/1160138" startId="F8">
<paragraph id="4FBDD93076B46677BF7BC45F69AB453D">
<label id="DCBE6E36E92DE584E4BB4B6029B6E46D">Figure 8.</label>
</paragraph>
<paragraph id="B8B5E694F1E81B049F6B076E70CF35D6">
Spines of the foregut and pleopods in
<taxonomicName id="B62A8AD348E2464A807D9363893F485C" authorityName="Wittmann &amp; Wirtz" authorityYear="2024" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="proincisa" status="sp. nov.">
<emphasis id="239D1A63F5C5D6D333C695E451A83C05" italics="true">Ischiomysis proincisa</emphasis>
</taxonomicName>
<taxonomicNameLabel id="D866619A249E4FFD834CBACEE85CA5DC" rank="species">sp. nov.</taxonomicNameLabel>
; paratypes adult ♂ (
<abbrev id="ABBRID0EVZAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.5 mm,
<emphasis id="4A7A550606815F396C55FC5A81D95170" bold="true">A – I</emphasis>
) and adult ♀ (
<abbrev id="ABBRID0E2ZAE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.3 mm,
<emphasis id="9BF9759017D3118C587D25ED920F3E68" bold="true">J, K</emphasis>
);
<emphasis id="304D2024C73CA1E08A13282B02F12CEA" bold="true">A – D.</emphasis>
Modified spines of the foregut in dorsal view, from the anterior (
<emphasis id="6F74C2EF7BCA91887E1DB3450DCA7D7A" bold="true">A, B</emphasis>
) and posterior (
<emphasis id="F210C7B8E85928C21C09967EF7831BD1" bold="true">C</emphasis>
) parts of the lateralia and from dorsolateral infolding (
<emphasis id="A64E92C1B089F2324E5ED18C1A4BE7ED" bold="true">D</emphasis>
);
<emphasis id="E1F0DA48985AD4180CD76338FC9CFD87" bold="true">E – I.</emphasis>
Series of right male pleopods 1–5, lateral = rostral face;
<emphasis id="7804746191CA9A8AB4F438C34A217B3B" bold="true">J.</emphasis>
Right female pleopod 1, lateral;
<emphasis id="6AB1509D00E5F2DA20217AEC481EF69E" bold="true">K.</emphasis>
Left female pleopod 5, lateral.
</paragraph>
</caption>
<caption id="FAED04E3BE8FE14F2FB21F1CB5268D07" ID-DOI="10.3897/zse.100.130288.figure9" ID-arpha="BE2A0CB7-6410-59DA-866C-445D8E0F3974" httpUri="https://binary.pensoft.net/fig/1160139" startId="F9">
<paragraph id="9D94087F7DD23B521346A81B08CA001C">
<label id="50BB404CB6BD022A33583D368D4995CA">Figure 9.</label>
</paragraph>
<paragraph id="C8028C0BECB233FCFE0904A59648E6D3">
<taxonomicName id="A38C2A06C30B56682B8749D1BA341C57" authorityName="Wittmann &amp; Wirtz" authorityYear="2024" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="proincisa" status="sp. nov.">
<emphasis id="06D3847FD41B02282076F95438A62DA0" italics="true">Ischiomysis proincisa</emphasis>
</taxonomicName>
<taxonomicNameLabel id="A104F447B8F48CC4125749C63525D4F0" rank="species">sp. nov.</taxonomicNameLabel>
; paratype adult ♂ (
<abbrev id="ABBRID0EH2AE" xlink_title="body length measured from anterior margin of carapace to terminus of telson without spines">BL</abbrev>
4.5 mm,
<emphasis id="67324E23F64C76825899354200BE5B55" bold="true">A, B</emphasis>
) and nauplioid larvae (
<emphasis id="42429AE7942174F3964FAC3B573C3EA0" bold="true">C, D</emphasis>
);
<emphasis id="80F2E75DB58813241E29799FDB23AD6D" bold="true">A.</emphasis>
Uropods, ventral;
<emphasis id="6A3F781C87421AE19599068ABDF757C8" bold="true">B.</emphasis>
Telson and right scutellum paracaudale (
<emphasis id="D517E2928AF72BAA98AA68591DEA6DE4" italics="true">sc</emphasis>
), ventral;
<emphasis id="7EC9F0717FC791CA7AAC0B1C8DBC8890" bold="true">C.</emphasis>
Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (
<emphasis id="427809A627ADF5E5371DA406B79F91B2" italics="true">a 1</emphasis>
) and antenna (
<emphasis id="B47DEEDE2292B01A580FCA4FF4BF5D28" italics="true">a 2</emphasis>
);
<emphasis id="2E4B52971C1A0336C8E33D8C39F2004B" bold="true">D.</emphasis>
Tip of pleon in another nauplioid specimen. Panel (
<emphasis id="860E6D8CAA247F8F2A3EBF1C40A8D313" bold="true">A</emphasis>
) combined from two photos;
<emphasis id="E52907B5B1D222A28700E18FCD1BD936" bold="true">A – D.</emphasis>
Green coloring of objects artificial;
<emphasis id="E4755BF5569FDD3DCEE9455A7015091E" bold="true">B – D.</emphasis>
Objects artificially separated from background.
</paragraph>
</caption>
</subSubSection>
<subSubSection id="SECID0EX3AE" type="description">
<paragraph id="2D4308114DE6FABA834407E6A972638E">
<heading id="958CB61163205348818A7A7D732486CA" reason="title">Description.</heading>
</paragraph>
<paragraph id="BD66AB25B5E791A40215FD4966DBD245">
All features of the diagnosis. General appearance robust. Body red
<emphasis id="DC884F20981D92574153C379BE643FC4" italics="true">in vivo</emphasis>
, length
<quantity id="5EF81AA911E6B6D7E955A9E0C3E6C455" metricMagnitude="-3" metricUnit="m" metricValue="4.15" metricValueMax="4.6" metricValueMin="3.7" unit="mm" value="4.15" valueMax="4.6" valueMin="3.7">3.7–4.6 mm</quantity>
in adult males (n = 15) and 4.0–
<quantity id="4A0AAF420EB7FD64F81B9670B9E4E4B1" metricMagnitude="-3" metricUnit="m" metricValue="4.3" unit="mm" value="4.3">4.3 mm</quantity>
in adult females (n = 3). Cephalothorax represents 28–33 % body length, pleon without telson 51–56 %, telson 11–12 %, carapace without rostrum 20–26 %, and rostrum 4–5 %.
</paragraph>
<paragraph id="0D002ED18117AFB28A50BFEE4378CAC0">
<emphasis id="443C8069EC9E020EB38C6B255D5463D6" bold="true" italics="true">Eyes</emphasis>
(Fig.
<figureCitation id="2DF6A6B1CD0A6991148F49AC69DDA673" captionStart="Figure 4" captionStartId="F4" captionText="Figure 4. Habitus of Ischiomysis proincisa sp. nov.; holotype adult ♂ (BL 3.9 mm, A, B, D) and paratype adult ♀ (4.2 mm, C); A, B. Holotype in toto, lateral (A) and dorsal (B); C. Paratype in toto, dorsal; D. Cephalic region of holotype, ventral. A – D. Photos of fixed specimens, objects artificially separated from background, green coloring of objects artificial." figureDoi="10.3897/zse.100.130288.figure4" httpUri="https://binary.pensoft.net/fig/1160134">4</figureCitation>
). Eyestalks and cornea dorsoventrally compressed by a factor of 1.2. Cornea diameter twice the length of the apical segment of the antennular trunk. Eyestalks finely hispid by minute scales. Organ of Bellonci ellipsoidal, length 1 / 6 cornea diameter.
</paragraph>
<paragraph id="50307B2BED95A01B1F904E8033F39294">
<emphasis id="A4FEDF31FDF2E0A327EE99C2E4D3B8CD" bold="true" italics="true">Carapace</emphasis>
(Fig.
<figureCitation id="BB4CEF5C5FC012B46F88149F663AE71A" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 G, H</figureCitation>
). The rostrum forms a distinct horizontal plate covering part of eyestalks. It reaches to 2 / 3 antero-posterior extension of normal-oriented eyestalks. Disto-lateral edges of the carapace well-rounded, anteriorly slightly produced. Posterior margin leaves the ultimate 1–1.5 thoracomere mid-dorsally exposed. As in many species of
<taxonomicName id="DADBDB0E61FC3E499C1EBEEDAE41426B" authorityName="Haworth" authorityYear="1825" class="Malacostraca" family="Mysidae" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="family">Mysidae</taxonomicName>
, two characteristic groups of pores present on the midline of the carapace. The anterior group (Fig.
<figureCitation id="CD04E9C11EFA659285D2038473B3497A" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 G</figureCitation>
) is shortly in front of the cervical sulcus and comprises 6–10 pores with &lt;1 μm diameter in symmetrical paramedian arrangement. The posterior pore group (Fig.
<figureCitation id="C760C53E168D52FAAF5A30355B9500FB" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 G, H</figureCitation>
) is shortly in front of the posterior margin of the carapace; this group consists of 10–12 pores with about 2 μm diameter surrounding a larger but indistinct, rounded structure. Except for the here stated structures, carapace with smooth outer surface.
</paragraph>
<paragraph id="68BAF40071E321B204662DEC3D73512D">
<emphasis id="5164DD0C92FEF8E04E2E1D5CAB0D7D5B" bold="true" italics="true">Antennulae</emphasis>
(Fig.
<figureCitation id="196AE7D6D7FC78F871032BFB28544D79" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 A – E</figureCitation>
). The trunk extends half its length beyond normal-oriented eyes. Measured along dorsal midline, the basal segment is 46–51 % trunk length, median 18–20 %, and terminal 30–34 %. Basal segment of the antennular trunk (Fig.
<figureCitation id="B70189EFC2FC160CD9704EE249CCF4C8" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 A, B</figureCitation>
) with two setose dorsal lobes (apophyses) near distal margin, in addition with a disto-lateral lobe; median and terminal segments each with one setose dorsal lobe near distal margin. Basal segment on basal half of its lateral face with 3–5 minute setae. The large barbed seta arising from the inner distal corner of the median segment not extending beyond the terminal segment in both sexes. The flagellum of the spine at the terminal segment of the antennular trunk inserts more apically in the male (Fig.
<figureCitation id="215B583E32086A0A48CDE9ACEF6638A4" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 D</figureCitation>
) compared to the female (Fig.
<figureCitation id="5C45852C1E220FFE1EEF89FFFA8FCF3D" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 E</figureCitation>
); this dimorphism also found in the congener
<taxonomicName id="8237EB9A94CF5A3C60D5A0C3AC12F999" authorityName="Wittmann" authorityYear="2013" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="telmatactiphila">
<emphasis id="7DC7ABCACB013EB7017A959A062C6E9B" italics="true">I. telmatactiphila</emphasis>
</taxonomicName>
. Epi-antennular process (solid line in Fig.
<figureCitation id="561B24926C709CDEFE477670FD4B9CC6" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 A</figureCitation>
) subtriangular with small, rostral, acute projection; hypo-antennular process (dashed line in Fig.
<figureCitation id="CB9722FC10CFAB74ABC7EE1217639E4B" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 A</figureCitation>
) subcircular with blunt subtriangular rostral projection.
</paragraph>
<paragraph id="C0E0FD88B7F3DB55FCC1C4C0593E0ED1">
<emphasis id="F5EE41A49C61D996C262812D878003B4" bold="true" italics="true">Antennae</emphasis>
(Fig.
<figureCitation id="DCF6D23F154FF5CB1ED31337D6FD1CF6" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 F</figureCitation>
). Sympod dorsally with terminally rounded, tongue-like process. Disto-lateral edge of sympod with tooth-like process. Sympod caudally with bulbous lobe containing end sac of antennal gland. Antennal scale setose all around. Apical segment, if distinct, contributes 11–16 % to total scale length. Peduncle 0.7–0.8 times scale length but extending to only about half scale length due to its more caudal insertion. Basal segment is 24–29 % the length of the peduncle, second is 27–31 %, and third is 44–46 %.
</paragraph>
<paragraph id="90C600AC73DBB9E02920183ECC3CEC81">
<emphasis id="00CDCB97077D6F2ABF8977DBB4783D41" bold="true" italics="true">Primary mouthparts</emphasis>
(Fig.
<figureCitation id="0894F6ED4F3831590016E10E0CE9E0C2" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 I, J</figureCitation>
and Fig.
<figureCitation id="214A4655BFF8AB01F7709725A576A1E8" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 A – C</figureCitation>
). Labrum (Fig.
<figureCitation id="7C229BACBA4C8173D8E1F729B4DFC9B7" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 I</figureCitation>
) weakly cuticularized, densely covered by short, stiff bristles. Paragnaths (Fig.
<figureCitation id="27AB7AD41BE6142CBD81D07ACD61151B" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 J</figureCitation>
) with moderately stiff bristles, no tooth-like bristles. Mandibular palp three-segmented (Fig.
<figureCitation id="CBE038C2175790B8FFBDB11CC944B585" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 A</figureCitation>
). Its proximal segment without setae, 8–12 % length of palp. Median segment: 63–65 % palp length. Its length 3.0–3.7 times maximum width. Its lateral margin almost all along with 8–9 smooth setae, an additional basally barbed seta in distal-most position. Mesial margin with 4–6 smooth setae distributed with mostly large interspaces. Terminal segment 27–28 % palp length. Its mesial margin bare except for some setae near apex; distal half of lateral margin densely setose. Pars molaris with well-developed though comparatively small grinding surface in both mandibles. Left mandible (Fig.
<figureCitation id="82C5CAE80F304FD981DBF03E1EE25C62" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 C</figureCitation>
) with pars incisiva bearing three teeth, digitus mobilis with two teeth, pars centralis with four basally thick, spiny teeth. Right mandible (Fig.
<figureCitation id="CD93487C2E43CD23209764A1D1C8F764" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 B</figureCitation>
) with pars incisiva bearing 4–5 teeth, digitus mobilis with two teeth; pars centralis with 3–4 separate bases each bearing numerous slender spines that are bilaterally armed with stiff bristles. Bases decreasing in size and numbers of spines orally.
</paragraph>
<paragraph id="AF82A459CDEAB0D63E481DBC4441CCF7">
<emphasis id="8F2C5641F30FC692DCC2B83C179DE851" bold="true" italics="true">Foregut</emphasis>
(Fig.
<figureCitation id="C638503CCE3DBEDED2FE2C1ABADAE16C" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8 A – D</figureCitation>
). Lateralia anteriorly with group of slender, apically coronate spines (Fig.
<figureCitation id="FFD50C7E30B7603722549DD0EC7594CB" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8 A</figureCitation>
) with small denticles along distal &lt;2 / 3 of the shaft. Lateralia more caudally with shorter, apically pronged spines (Fig.
<figureCitation id="35B8A12F342637AD311CEC453A733746" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8 B</figureCitation>
) bearing small denticles along&gt; 2 / 3. Lateralia on each side of the foregut more caudally with cluster of 6–7 weakly, in part indistinctly serrated spines (Fig.
<figureCitation id="E8FA6457666187DD3F500DD2ECB8A601" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8 C</figureCitation>
) of varying size. Dorsolateral infoldings each with cluster of three strong rugose spines (Fig.
<figureCitation id="08F9955275665E53F3AD13E61431C287" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8 D</figureCitation>
).
</paragraph>
<paragraph id="6B00A128D6992A536741CE0BA877EA5D">
<emphasis id="4FD14013FC7076786B8505398D565A55" bold="true" italics="true">Maxillula</emphasis>
(Fig.
<figureCitation id="A358C2FAE012D53E6E13B2BFE78B7D7C" captionStart="Figure 5" captionStartId="F5" captionText="Figure 5. Ischiomysis proincisa sp. nov., paratypes adult ♀ (BL 4.3 mm, A, E, I) and adult ♂ (BL 4.5 mm, B – D, F – H, J – K); A. Right female antennula with associated processes from the frons, dorsal; B. Left male antennula, dorsal; details of the terminal segment of the trunk show the disto-median lobe (C) and the disto-mesial flagellate spine (D); E. Disto-mesial flagellate spine from left female antennula, dorsal; F. Antenna with antennal gland, dorsal, many setae omitted from the antennal scale; G. Carapace expanded on slide; H. Detail of (G) showing posterior pore group, pore diameters not to scale; I. Labrum, aboral face; J. Labium, frontal face; K. Maxillula, caudal." figureDoi="10.3897/zse.100.130288.figure5" httpUri="https://binary.pensoft.net/fig/1160135">5 K</figureCitation>
). Distal segment terminally with series of 10–11 strong spines, among which the two most peripheral spines are largest and subapically serrated, whereas the spines in between are weakly or not serrated. This segment subterminally with two short setae bearing long barbs on their distal 2 / 3; no pores detected near these setae. These setae not reaching the basis of the spines. Only two short setae also found in the congener
<taxonomicName id="8F9DB3C2EAF950A5F4197BFCD0DD1978" authorityName="Wittmann" authorityYear="2013" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="telmatactiphila">
<emphasis id="70B8D124CE6FF193173EAC2C9D9FF645" italics="true">I. telmatactiphila</emphasis>
</taxonomicName>
, whereas most
<taxonomicName id="0DECE182C8C0FA4438A3C61A68E2BDF2" authorityName="Haworth" authorityYear="1825" class="Malacostraca" family="Mysidae" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="family">Mysidae</taxonomicName>
species show more and longer setae of that kind. Endite of the maxillula terminally with three large spiny setae accompanied by three shorter setae of that kind, caudal face with two small barbed setae.
</paragraph>
<paragraph id="A85717DE33E4D4F4E8BEC152BF96F3D3">
<emphasis id="5DDE1AAF816A248FD32C974DB3E9DF7B" bold="true" italics="true">Maxilla</emphasis>
(Fig.
<figureCitation id="1AFF7C7D765712B2C99A77830A5C21C1" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 D</figureCitation>
) with terminal segment of palp 1.6–1.8 times longer than wide and 1.3–1.6 times length of the basal segment. Terminal segment with densely setose mesial margin; only 3–4 setae along distal 2 / 3 of the lateral margin, no spines. Basal segment with three basally thick, barbed setae.
</paragraph>
<paragraph id="F0BFF0ED07B952A9AF625177B6542084">
<emphasis id="0F07224379936F433684E3A175F198F9" bold="true" italics="true">Thoracic sternites</emphasis>
(Fig.
<figureCitation id="71AA5B6EBE7EF05C97A3351757064BFD" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 E</figureCitation>
). Sternite 1 with small, about linguiform anterior lobe. Sternites 2–8 without median processes in both sexes. Sternite 2 with 1–3 barbed setae on intersegmental joint with thoracopod 2. Penes distally ending in 4 lobes, no setae.
</paragraph>
<paragraph id="E40733F6BD25AE86DF488884DF32651B">
<emphasis id="0A920A3A3AD913BE2A0C997F444575F1" bold="true" italics="true">Thoracopods in general</emphasis>
(Fig.
<figureCitation id="80F8BA0B3525ABA8E1C056861A49AF00" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 F – M</figureCitation>
and Fig.
<figureCitation id="74D287EDE807A3D51C6F2AAB4B52AD9E" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7</figureCitation>
). Basal plate (Fig.
<figureCitation id="F48513E87110432498BDA33B0DE50245" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 P</figureCitation>
) of exopods expanded, length 1.5–1.9 times maximum width. Lateral margin of the plates ends in a broadly rounded corner. Flagellum of exopods 1–8 with 8, 9, 9, 9, 9, 9, 9, and 9 segments (Fig.
<figureCitation id="C26ED99FF2DDC2C15EF5540239AE1652" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 P</figureCitation>
), respectively. Thoracopod 1 with large, leaf-like, smooth epipod. Basis (fused with sympod) of endopod 2 (Fig.
<figureCitation id="11C72B8C05CF744C035A41B46E345FB5" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 I</figureCitation>
) with comparatively large lappet-like apophysis on rostral face; this apophysis small in endopods 3–8 (Fig.
<figureCitation id="3BFAFCDE84B04E70AFFB7CD2D5D01686" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 K</figureCitation>
and Fig.
<figureCitation id="C282C90368CCDE22A93124B7CDE305E9" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 A, L, P</figureCitation>
); no such apophysis in endopod 1. Ischium shorter than merus in endopods 1–4 (Fig.
<figureCitation id="F7A57980891BB23F35B9EAF8FCE575D0" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 F, I, K</figureCitation>
, and Fig.
<figureCitation id="B1A1CD4F09749F6718700E52BE9F46A9" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 A</figureCitation>
), but longer than merus in endopods 5–8 (Fig.
<figureCitation id="43BE2F64591D974EE70C7B9A23DB2297" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 L, P</figureCitation>
). Thoracic endopods 1–2 each with dactylus (Fig.
<figureCitation id="198D329C8502E6E7E24190B0C43DC6E1" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 G, J</figureCitation>
) larger than that of endopods 3–8 (Fig.
<figureCitation id="239F252AAA476E72A3E602BC55070695" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 F – K</figureCitation>
); dactylus 3 (Fig.
<figureCitation id="E309CA6805C86B1531EAB6F2C6D7780F" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 F</figureCitation>
) wider but not longer than dactyli 4–8 (Fig.
<figureCitation id="FFF97A615CA339780DDCF9D8216FFA8E" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 G – K</figureCitation>
). Dactylus 1 with slender, weakly bent claw which is bilaterally “ serrated ” by stiff bristles along median portions (Fig.
<figureCitation id="90D2B6063D4548F2EC867446CBABD81D" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 G, H</figureCitation>
). Claw 2 unilaterally rugose along proximal 2 / 3 (Fig.
<figureCitation id="23C22822F29F501B1235D1C1C63739EF" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 J</figureCitation>
). Claw 3 strong, somewhat bent, smooth (Fig.
<figureCitation id="F6044B90433F95F824C86DC4F4893545" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 F</figureCitation>
). For claw 4, see “ Diagnosis ”. Claws 5–8 weakly bent, “ serrated ” in subapical portions (Fig.
<figureCitation id="EAC7E695F95968140B8D62C8B4117F83" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 H – K</figureCitation>
). Combined praeischium plus ischium of endopod 2 (Fig.
<figureCitation id="8599588AA4BB8FD3D39079B3B2E810CA" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 I</figureCitation>
) are 0.6 times merus length, carpopropodus plus dactylus 1.1 times merus. Dactylus 2 very large, with dense brush formed by large numbers of normal setae and 6–10 modified setae, the latter apically bent, bearing double series of stiff barbs along proximal 2 / 3 to 3 / 4.
</paragraph>
<paragraph id="9347DAB2DD0549F9AC7CB251A537EF3F">
<emphasis id="3DEE90BF83F2CF3C4DA51E3CA604533A" bold="true" italics="true">Gnathopods</emphasis>
(Fig.
<figureCitation id="23FA61635922857F78033988A47B79CB" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 A – F</figureCitation>
). Thoracic endopod 3 forms a powerful subchela. Basis with much shorter endite (Fig.
<figureCitation id="9102BCA175321C8176761A582D165339" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 A</figureCitation>
), if any, compared to that (Fig.
<figureCitation id="9216C9AF656BA02738E207EE68686DDA" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Ischiomysis proincisa sp. nov.; paratypes adult ♀ (BL 4.3 mm, A – D) and adult ♂ (BL 4.5 mm, E – M); A. Right mandible with palpus, caudal; B, C. Masticatory parts of right (B) and left (C) mandibles, caudal; D. Maxillary palp, rostral; E. Thoracic sternites 1–8 with penes, ventral; F. Thoracic endopod 1 with part of coxa, caudal; G. Detail of (F) showing dactylus 1 with claw, setae omitted; H. Secondary detail of (F) showing claw 1; I. Thoracic endopod 2, rostral; J. Detail of (I) showing dactylus 2 with claw, setae omitted; K. Thoracic endopod 4 with basis (sympod), rostral; L, M. Details of (K) showing modified setae of the carpus (L) and the propodus (M)." figureDoi="10.3897/zse.100.130288.figure6" httpUri="https://binary.pensoft.net/fig/1160136">6 I</figureCitation>
) of endopod 2. Ischium of endopod 3 is 2.6–3.0 times as long as wide; merus 4.5–5.1 times as long as wide and 1.4–1.6 times length of ischium. Ischium and merus strong, with smooth setae only. Disto-mesial edge of merus with short longitudinal ridge bearing two setae (Fig.
<figureCitation id="4C6B33DC227645D081753CB119BD9D62" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 E</figureCitation>
). Carpopropodus as long as 0.8–0.9 times merus and 1.2–1.3 times ischium. Length of carpus 3.4–3.5 times maximum width.
</paragraph>
<paragraph id="D981D53C1D3E6BD9D78FA4A96C2D2298">
<emphasis id="563AAAD4434598A681B6CD5C232C5C9A" bold="true" italics="true">Marsupium</emphasis>
(Fig.
<figureCitation id="09EC25F611DBC00F7DC432D4C6582D59" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 P, R</figureCitation>
). Ultimate (third) oostegite rolled inwards to form two widely communicating sub-chambers. Its rostral and ventral margins with dense series of barbed (plumose) setae; inside with 5–9 microserrated setae close to the insertion on thoracic sympod 8; ventral half of oostegite 3 with about 7–10 small whip setae (Fig.
<figureCitation id="1224F0384D613E645BCDF466AFBCAD32" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Thoracopods 3–8 in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A, B, G – O) and adult ♀ (BL 4.3 mm, C – F, P – R); A. Male thoracic endopod 3, rostral; details (B) show the flagellate spines of the carpus; C. Tarsus and distal portion of the merus in female thoracic endopod 3, rostral; details show the flagellate spines of the carpus (D) and the disto-mesial carina of the merus (E); F – K. Series of dactyli 3–8 with claw, setae omitted; L. Male thoracic endopod 8, caudal; details show the flagellate spines (M, N) of the ischium and the modified praeischium (O) with large tooth-like projection; P. Female thoracopod 8 with outer face of oostegite 3, lateral; details show a normal smooth seta (Q) of the ischium and a subapically flagellate whip seta (R) from the outer face of the oostegite." figureDoi="10.3897/zse.100.130288.figure7" httpUri="https://binary.pensoft.net/fig/1160137">7 R</figureCitation>
) loosely scattered over the outer surface.
</paragraph>
<paragraph id="93AC3C2EA0B151CA3D6636FF69E39664">
<emphasis id="D1709F8ABAF72970074CED1A75B0DA59" bold="true" italics="true">Pleon</emphasis>
(Fig.
<figureCitation id="3EC536F31025911A27C3FCB2F6BC2779" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8 E – K</figureCitation>
). Pleomeres 1–5 measure 0.7–0.9, 0.6–0.8, 0.7–0.9, 0.6–0.9, and 0.7–0.8 times the length of pleomere 6, respectively; in other words, pleomere 6 is always shorter than combined pleomeres 4–5. Length without setae increases in series of pleopod 1, followed by subequal pleopods 2–4, and then by the much longer and slender pleopod 5. Pleopods 1–5 (Fig.
<figureCitation id="552261A7796C4E2878BA18076762866E" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Spines of the foregut and pleopods in Ischiomysis proincisa sp. nov.; paratypes adult ♂ (BL 4.5 mm, A – I) and adult ♀ (BL 4.3 mm, J, K); A – D. Modified spines of the foregut in dorsal view, from the anterior (A, B) and posterior (C) parts of the lateralia and from dorsolateral infolding (D); E – I. Series of right male pleopods 1–5, lateral = rostral face; J. Right female pleopod 1, lateral; K. Left female pleopod 5, lateral." figureDoi="10.3897/zse.100.130288.figure8" httpUri="https://binary.pensoft.net/fig/1160138">8 E – K</figureCitation>
) mainly with plumose or barbed setae, but there are 1–3 smooth seta only in subbasal position on the outer margin; the latter setae clearly representing whip setae in pleopod 5 of both sexes. Pleopods 1–5 show no other types of setae, no extraordinarily long setae, no spines or teeth.
</paragraph>
<paragraph id="1617E85F9E1CCFA3B9BE676284708684">
<emphasis id="594EF35CB679A621251C36AEDD0DA9E5" bold="true" italics="true">Tail fan</emphasis>
(Fig.
<figureCitation id="245A3C71BBB0DFA40654876654F9B9F3" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Ischiomysis proincisa sp. nov.; paratype adult ♂ (BL 4.5 mm, A, B) and nauplioid larvae (C, D); A. Uropods, ventral; B. Telson and right scutellum paracaudale (sc), ventral; C. Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (a 1) and antenna (a 2); D. Tip of pleon in another nauplioid specimen. Panel (A) combined from two photos; A – D. Green coloring of objects artificial; B – D. Objects artificially separated from background." figureDoi="10.3897/zse.100.130288.figure9" httpUri="https://binary.pensoft.net/fig/1160139">9 A, B</figureCitation>
). Scutellum paracaudale (labeled “
<emphasis id="00109A9E8CDB210CB7B57ACFA43276C0" italics="true">sc</emphasis>
” in Fig.
<figureCitation id="EF85BD78FC4BA20F4991174C051F7564" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Ischiomysis proincisa sp. nov.; paratype adult ♂ (BL 4.5 mm, A, B) and nauplioid larvae (C, D); A. Uropods, ventral; B. Telson and right scutellum paracaudale (sc), ventral; C. Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (a 1) and antenna (a 2); D. Tip of pleon in another nauplioid specimen. Panel (A) combined from two photos; A – D. Green coloring of objects artificial; B – D. Objects artificially separated from background." figureDoi="10.3897/zse.100.130288.figure9" httpUri="https://binary.pensoft.net/fig/1160139">9 B</figureCitation>
) forms a well-rounded shield covering the basolateral edge of the telson. Exopod of uropods (Fig.
<figureCitation id="19AC8C0A369765ACBDB35044D8D94E9B" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Ischiomysis proincisa sp. nov.; paratype adult ♂ (BL 4.5 mm, A, B) and nauplioid larvae (C, D); A. Uropods, ventral; B. Telson and right scutellum paracaudale (sc), ventral; C. Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (a 1) and antenna (a 2); D. Tip of pleon in another nauplioid specimen. Panel (A) combined from two photos; A – D. Green coloring of objects artificial; B – D. Objects artificially separated from background." figureDoi="10.3897/zse.100.130288.figure9" httpUri="https://binary.pensoft.net/fig/1160139">9 A</figureCitation>
): 4.9–5.6 times longer than broad, inner margin convex, outer margin very slightly concave, almost straight, 1.2–1.4 times the length of endopod. Statoliths composed of fluorite; shape discoid, diameter 60–136 µm, maximum thickness 27–60 µm, statolith formula 2 + 3 + (5–7) + (1–2) + (4–5) = 15–19 (n = 12). Telson (Fig.
<figureCitation id="483B0ADE970A75B3B89A3D14B64950DF" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Ischiomysis proincisa sp. nov.; paratype adult ♂ (BL 4.5 mm, A, B) and nauplioid larvae (C, D); A. Uropods, ventral; B. Telson and right scutellum paracaudale (sc), ventral; C. Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (a 1) and antenna (a 2); D. Tip of pleon in another nauplioid specimen. Panel (A) combined from two photos; A – D. Green coloring of objects artificial; B – D. Objects artificially separated from background." figureDoi="10.3897/zse.100.130288.figure9" httpUri="https://binary.pensoft.net/fig/1160139">9 B</figureCitation>
) shaped as in
<taxonomicName id="A78FC4190386AF9497361EEAC9DD4464" authorityName="Wittmann" authorityYear="2013" class="Malacostraca" family="Mysidae" genus="Ischiomysis" higherTaxonomySource="GBIF" kingdom="Animalia" order="Mysida" phylum="Arthropoda" rank="species" species="telmatactiphila">
<emphasis id="3022A8D9D8D26B349950BA5D9F1390E4" italics="true">I. telmatactiphila</emphasis>
</taxonomicName>
, length is 1.1 times endopod of uropod and 0.8–0.9 times exopod of uropod. Spines on lateral margins continuously increase in size from half-length to 3 / 4 - length of lateral margins and then decrease weakly in size distally. Laminae of the cleft are shorter than the pair of disto-mesial spines flanking the cleft. For additional details, see “ Diagnosis. ”
</paragraph>
<paragraph id="A461B5BB17C398BA9C103793E86DDB39">
<emphasis id="9256D72C606B7B25A02E0E4F76F9A438" bold="true" italics="true">Nauplioid larvae</emphasis>
(Fig.
<figureCitation id="0F41CFF4D7C911D16DF750608F9509BE" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Ischiomysis proincisa sp. nov.; paratype adult ♂ (BL 4.5 mm, A, B) and nauplioid larvae (C, D); A. Uropods, ventral; B. Telson and right scutellum paracaudale (sc), ventral; C. Nauplioid larva at substage N 4, lateral; lower case labels indicate antennula (a 1) and antenna (a 2); D. Tip of pleon in another nauplioid specimen. Panel (A) combined from two photos; A – D. Green coloring of objects artificial; B – D. Objects artificially separated from background." figureDoi="10.3897/zse.100.130288.figure9" httpUri="https://binary.pensoft.net/fig/1160139">9 C, D</figureCitation>
) with three pairs of free naupliar appendages. Apical portions of antennulae, antennae, and abdomen with minute hairs.
</paragraph>
</subSubSection>
</treatment>
</document>
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