682 lines
102 KiB
XML
682 lines
102 KiB
XML
<document ID-DOI="http://dx.doi.org/10.3897/zookeys.1079.76412" ID-GBIF-Dataset="90785384-12f1-40ef-aa18-5e08ff36e4bc" ID-PMC="PMC8741714" ID-Pensoft-Pub="1313-2970-1079-145" ID-Pensoft-UUID="C75BE4A1E65C51598D01C9EA871B90E5" ID-PubMed="35068961" ID-ZooBank="55F9DF83DE924EC3ACEC05AA4466F147" ModsDocID="1313-2970-1079-145" checkinTime="1641053224064" checkinUser="pensoft" docAuthor="Wittmann, Karl J. & Chevaldonne, Pierre" docDate="2021" docId="FBB444BDF1A45E0699F6B834D61E895B" docLanguage="en" docName="ZooKeys 1079: 145-227" docOrigin="ZooKeys 1079" docPubDate="2021-12-31" docSource="http://dx.doi.org/10.3897/zookeys.1079.76412" docTitle="Mysidetes illigi Zimmer 1914" docType="treatment" docVersion="4" id="C75BE4A1E65C51598D01C9EA871B90E5" lastPageNumber="145" masterDocId="C75BE4A1E65C51598D01C9EA871B90E5" masterDocTitle="First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species" masterLastPageNumber="227" masterPageNumber="145" pageNumber="145" updateTime="1668151265394" updateUser="ExternalLinkService">
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<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
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<mods:titleInfo>
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<mods:title>First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species</mods:title>
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</mods:titleInfo>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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<mods:namePart>Wittmann, Karl J.</mods:namePart>
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<mods:affiliation>Department of Environmental Health, Medical University of Vienna, Kinderspitalgasse 15, 1090 Vienna, Austria. Corresponding author</mods:affiliation>
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<mods:nameIdentifier type="email">karl.wittmann@meduniwien.ac.at</mods:nameIdentifier>
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</mods:name>
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<mods:name type="personal">
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<mods:role>
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<mods:roleTerm>Author</mods:roleTerm>
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</mods:role>
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<mods:namePart>Chevaldonne, Pierre</mods:namePart>
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<mods:affiliation>IMBE, CNRS, IRD, Aix Marseille Universite, Avignon Universite, Station Marine d'Endoume, Rue de la Batterie des Lions, 13007 Marseille, France</mods:affiliation>
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</mods:name>
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<mods:typeOfResource>text</mods:typeOfResource>
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<mods:title>ZooKeys</mods:title>
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</mods:titleInfo>
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<mods:part>
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<mods:date>2021</mods:date>
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<mods:detail type="pubDate">
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<mods:number>2021-12-31</mods:number>
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</mods:detail>
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<mods:detail type="volume">
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<mods:number>1079</mods:number>
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</mods:detail>
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<mods:extent unit="page">
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<mods:start>145</mods:start>
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<mods:end>227</mods:end>
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<mods:url>http://dx.doi.org/10.3897/zookeys.1079.76412</mods:url>
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</mods:location>
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<mods:classification>journal article</mods:classification>
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<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.1079.76412</mods:identifier>
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<mods:identifier type="Pensoft-Pub">1313-2970-1079-145</mods:identifier>
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<mods:identifier type="ZooBank">55F9DF83DE924EC3ACEC05AA4466F147</mods:identifier>
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<mods:identifier type="Pensoft-UUID">C75BE4A1E65C51598D01C9EA871B90E5</mods:identifier>
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<treatment ID-GBIF-Taxon="191828697" LSID="urn:lsid:plazi:treatment:FBB444BDF1A45E0699F6B834D61E895B" httpUri="http://treatment.plazi.org/id/FBB444BDF1A45E0699F6B834D61E895B" lastPageNumber="145" pageId="0" pageNumber="145">
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<subSubSection pageId="0" pageNumber="145" type="nomenclature">
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<paragraph pageId="0" pageNumber="145">
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<taxonomicName LSID="FBB444BD-F1A4-5E06-99F6-B834D61E895B" authority="Zimmer, 1914, bona species" authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysida" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">Mysidetes illigi Zimmer, 1914, bona species</taxonomicName>
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="145" type="description">
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<paragraph pageId="0" pageNumber="145">
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<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Mysidetes illigi from ice cave of Bernard Island, Antarctica A subadult male, dorsal B subadult male, lateral C hyperbenthic association formed by mysids and early stages of nothotheniid fish D fish swarm mixed with small number of mysids several metres inside cave A, B, living specimens in laboratory." figureDoi="10.3897/zookeys.1079.76412.figure7" httpUri="https://binary.pensoft.net/fig/629317" pageId="0" pageNumber="145">Figures 7</figureCitation>
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<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">, 8</figureCitation>
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<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E), 18.4 mm (B) A head, lateral B anterior body region, dorsal, dashed line enhances the anterior contour of carapace C paired circular structures symmetrically arranged in front of posterior margin of carapace D series of cuticle structures parallel to lateral margin of carapace E tail fan, lateral." figureDoi="10.3897/zookeys.1079.76412.figure9" httpUri="https://binary.pensoft.net/fig/629319" pageId="0" pageNumber="145">, 9</figureCitation>
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<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">, 10</figureCitation>
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<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">, 11</figureCitation>
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<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Cardiac portion of foregut in Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult female BL 18.1 mm A foregut in dorsal view, food removed from right half, lower-case labels indicate dorsolateral infoldings (di), lateralia (la), mid-gut (mg) and storage space (sp) B spine group from dorsolateral infoldings C spinose lobe of posterior part of lateralia D, E spines from median portions of lateralia." figureDoi="10.3897/zookeys.1079.76412.figure12" httpUri="https://binary.pensoft.net/fig/629322" pageId="0" pageNumber="145">, 12</figureCitation>
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<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">, 13</figureCitation>
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<figureCitation captionStart="Figure 25" captionStartId="F25" captionText="Figure 25. Surface details of appendix masculina and its female homologue in series of increasing body size for Mysidetes illigi (A-C) and M. hanseni (D) from Antarctic ice caves. A immature male BL 12.1 mm B subadult male 14.7 mm C adult female 18.4 mm D adult male 24.7 mm." figureDoi="10.3897/zookeys.1079.76412.figure25" httpUri="https://binary.pensoft.net/fig/629335" pageId="0" pageNumber="145">, 25A-C</figureCitation>
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="145" type="reference_group">
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<paragraph pageId="0" pageNumber="145">
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<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysida" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">Mysidetes illigi</taxonomicName>
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Zimmer, 1914: 404-405, Figs 47-49 in Fig.-Tab. XXVI (first description).
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</paragraph>
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<paragraph pageId="0" pageNumber="145">
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<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes Illigi" order="Mysida" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="Illigi">Mysidetes Illigi</taxonomicName>
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,
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<bibRefCitation author="Hansen, HJ" journalOrPublisher="Arkiv foer Zoologi" pageId="0" pageNumber="145" pagination="1 - 7" refId="B23" refString="Hansen, HJ, 1921. On some malacostracous Crustacea (Mysidacea, Euphausiacea, and Stomatopoda) collected by the Swedish Antarctic expeditions. Arkiv foer Zoologi 13 (20): 1 - 7" title="On some malacostracous Crustacea (Mysidacea, Euphausiacea, and Stomatopoda) collected by the Swedish Antarctic expeditions." volume="13" year="1921">Hansen 1921</bibRefCitation>
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: 5 (proposed validity check).
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</paragraph>
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<paragraph pageId="0" pageNumber="145">
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<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysida" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">Mysidetes illigi</taxonomicName>
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referred to as synonym of
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<taxonomicName authorityName="Holt & W. M. Tattersall" authorityYear="1906" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes posthon" order="Mysida" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="posthon">Mysidetes posthon</taxonomicName>
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: W.M.
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<bibRefCitation author="British Antarctic (Terra Nova) Expedition, 1910" journalOrPublisher="British Museum (Natural History), Zoology" pageId="0" pageNumber="145" pagination="273 - 304" refId="B97" refString="British Antarctic (Terra Nova) Expedition, 1910, 1923. Crustacea. Part. VII. - Mysidacea. In: Natural History Report. British Museum (Natural History), Zoology 3: 273 - 304" title="Crustacea. Part. VII. - Mysidacea." volume="3" volumeTitle="Natural History Report." year="1923">Tattersall 1923</bibRefCitation>
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: 275, 288;
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<bibRefCitation author="Illig, G" editor="Chun, C" journalOrPublisher="Gustav Fischer Verlag, Jena 22" pageId="0" pageNumber="145" pagination="397 - 620" refId="B33" refString="Illig, G, 1930. Die Schizopoden der Deutschen Tiefsee-Expedition. In: Chun, C, Ed., Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898-1899. Gustav Fischer Verlag, Jena 22: 397 - 620" title="Die Schizopoden der Deutschen Tiefsee-Expedition." volumeTitle="Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer " Valdivia " 1898 - 1899." year="1930">Illig 1930</bibRefCitation>
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: 470, 581;
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<bibRefCitation DOI="https://doi.org/10.1007/978-1-4471-3802-0_20" author="Mueller, H-G" journalOrPublisher="Mueller, Wetzlar" pageId="0" pageNumber="145" refId="B56" refString="Mueller, H-G, 1993. World catalogue and bibliography of the recent Mysidacea. Wissenschaftlicher Verlag H.-G. Mueller, Wetzlar, DOI: https://doi.org/10.1007/978-1-4471-3802-0_20" title="World catalogue and bibliography of the recent Mysidacea. Wissenschaftlicher Verlag H. - G." url="https://doi.org/10.1007/978-1-4471-3802-0_20" year="1993">
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<normalizedToken originalValue="Müller">Mueller</normalizedToken>
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1993
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</bibRefCitation>
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: 164;
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<bibRefCitation author="Mees, J" journalOrPublisher="Academic Press, London" pageId="0" pageNumber="145" publicationUrl="http://www.marinespecies.org/index.php" refId="B51" refString="Mees, J, Meland, K, 2021. World List of Lophogastrida, Stygiomysida and Mysida. World Register of Marine Species. http://www.marinespecies.org/index.php" title="World List of Lophogastrida, Stygiomysida and Mysida. World Register of Marine Species." url="http://www.marinespecies.org/index.php" year="2021">Mees and Meland 2021</bibRefCitation>
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: AphiaID = 451694 (unaccepted).
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="145" type="type series">
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<paragraph pageId="0" pageNumber="145">Type series.</paragraph>
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<paragraph pageId="0" pageNumber="145">
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Holotype (by monotypy) subadult female (ZMB 18284) BL 12.7 mm, in vial with ethanol, labelled
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<normalizedToken originalValue="“D.-Südpol">"D.-Suedpol</normalizedToken>
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.-Exp. 31.12.1902, 200 m.
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<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">
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<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes illigi</emphasis>
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</taxonomicName>
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sp. nov. Typus". Type not explicitly defined by
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<bibRefCitation author="Zimmer, C" editor="Drygalski, E von" journalOrPublisher="Georg Reimer, Berlin" pageId="0" pageNumber="145" pagination="377 - 445" refId="B123" refString="Zimmer, C, 1914. Die Schizopoden der deutschen Suedpolar-Expedition 1901-1903. In: Drygalski, E von, Ed., Deutsche Suedpolar-Expedition 1901-1903, XV. Zoologie. Georg Reimer, Berlin 7: 377 - 445" title="Die Schizopoden der deutschen Suedpolar-Expedition 1901 - 1903." volume="7" volumeTitle="Deutsche Suedpolar-Expedition 1901 - 1903, XV. Zoologie." year="1914">Zimmer (1914)</bibRefCitation>
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. In accordance with the text by
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<bibRefCitation author="Zimmer, C" editor="Drygalski, E von" journalOrPublisher="Georg Reimer, Berlin" pageId="0" pageNumber="145" pagination="377 - 445" refId="B123" refString="Zimmer, C, 1914. Die Schizopoden der deutschen Suedpolar-Expedition 1901-1903. In: Drygalski, E von, Ed., Deutsche Suedpolar-Expedition 1901-1903, XV. Zoologie. Georg Reimer, Berlin 7: 377 - 445" title="Die Schizopoden der deutschen Suedpolar-Expedition 1901 - 1903." volume="7" volumeTitle="Deutsche Suedpolar-Expedition 1901 - 1903, XV. Zoologie." year="1914">Zimmer (1914)</bibRefCitation>
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, the label of the jar containing this vial indicates 21.12.1902 as the date of sampling. According to
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<bibRefCitation author="Zimmer, C" editor="Drygalski, E von" journalOrPublisher="Georg Reimer, Berlin" pageId="0" pageNumber="145" pagination="377 - 445" refId="B123" refString="Zimmer, C, 1914. Die Schizopoden der deutschen Suedpolar-Expedition 1901-1903. In: Drygalski, E von, Ed., Deutsche Suedpolar-Expedition 1901-1903, XV. Zoologie. Georg Reimer, Berlin 7: 377 - 445" title="Die Schizopoden der deutschen Suedpolar-Expedition 1901 - 1903." volume="7" volumeTitle="Deutsche Suedpolar-Expedition 1901 - 1903, XV. Zoologie." year="1914">Zimmer (1914)</bibRefCitation>
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, this specimen was taken on this day together with one specimen (now lectotype) of
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<taxonomicName lsidName="M. hanseni" pageId="0" pageNumber="145" rank="species" species="hanseni">
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<emphasis italics="true" pageId="0" pageNumber="145">M. hanseni</emphasis>
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</taxonomicName>
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with a vertical haul 200-0 m at the
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<normalizedToken originalValue="‘Winterstation’">'Winterstation'</normalizedToken>
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(=
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<emphasis bold="true" pageId="0" pageNumber="145">Gauss Station</emphasis>
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),
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<geoCoordinate degrees="66" direction="south" minutes="02" orientation="latitude" precision="925" value="-66.03333">66°02'S</geoCoordinate>
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,
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<geoCoordinate degrees="89" direction="east" minutes="38" orientation="longitude" precision="925" value="89.63333">89°38'E</geoCoordinate>
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, coast of East Antarctica, S#9.
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</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="145" type="non-types from ice caves">
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<paragraph pageId="0" pageNumber="145">Non-types from ice caves.</paragraph>
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<paragraph pageId="0" pageNumber="145">
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Three samples (S#2-4) taken in austral summer 2015-2016 by P.
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<normalizedToken originalValue="Chevaldonné">Chevaldonne</normalizedToken>
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and S. Hourdez upon diving in an ice cave of
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<emphasis bold="true" pageId="0" pageNumber="145">Bernard Island</emphasis>
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, near Dumont
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<normalizedToken originalValue="d’Urville">d'Urville</normalizedToken>
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Station,
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<normalizedToken originalValue="Adélie">Adelie</normalizedToken>
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Land, Antarctica,
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<geoCoordinate degrees="66" direction="south" minutes="39.64" orientation="latitude" precision="9" value="-66.66067">66°39.64'S</geoCoordinate>
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,
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<geoCoordinate degrees="140" direction="east" minutes="01.55" orientation="longitude" precision="9" value="140.02583">140°01.55'E</geoCoordinate>
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:
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</paragraph>
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<paragraph pageId="0" pageNumber="145">One spent female (♀0-) BL 17.9 mm, 5 ♂♂S 13.2-15.0 mm, 2 ♂♂I 12.1-12.9 mm, 1 ♀S+ 13.9 mm, 5 ♀♀I 12.3-14.1 mm (in vials, NHMW 27298, SMF-57647, ZMB 34882, ZMH-K-60866), S#3; 1 ♀0- 18.1 mm (on slides; NHMW 27300), 5 ♀♀0- 14.2-15.9 mm, 3 ♂♂S 11.3-12.6 mm, 2 ♀♀S- 14.3-15.7 mm, 1 ♀S+ 15.5 mm, 7 ♀♀I (in vials, NHMW 27299, SMF-57648, ZMB 34883, ZMH-K-60867), S#4; 1 ♀0- 18.4 mm (on slides, NHMW 27301) and 1 ♀I 15.6 mm (in vial), S#2.</paragraph>
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</subSubSection>
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<subSubSection pageId="0" pageNumber="145" type="diagnosis">
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<paragraph pageId="0" pageNumber="145">Diagnosis.</paragraph>
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<paragraph pageId="0" pageNumber="145">Covers adult females and subadults of both sexes:</paragraph>
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<paragraph pageId="0" pageNumber="145">
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Species of
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<taxonomicName authorityName="Holt & Tattersall" authorityYear="1906" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="genus">
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<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes</emphasis>
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</taxonomicName>
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with eyes (Figs
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<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Mysidetes illigi from ice cave of Bernard Island, Antarctica A subadult male, dorsal B subadult male, lateral C hyperbenthic association formed by mysids and early stages of nothotheniid fish D fish swarm mixed with small number of mysids several metres inside cave A, B, living specimens in laboratory." figureDoi="10.3897/zookeys.1079.76412.figure7" httpUri="https://binary.pensoft.net/fig/629317" pageId="0" pageNumber="145">7A, B</figureCitation>
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,
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<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E), 18.4 mm (B) A head, lateral B anterior body region, dorsal, dashed line enhances the anterior contour of carapace C paired circular structures symmetrically arranged in front of posterior margin of carapace D series of cuticle structures parallel to lateral margin of carapace E tail fan, lateral." figureDoi="10.3897/zookeys.1079.76412.figure9" httpUri="https://binary.pensoft.net/fig/629319" pageId="0" pageNumber="145">9A, B</figureCitation>
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) well-developed, thick. Cornea calotte-shaped, its length 0.8 times length of eyestalk, diameter 1.6-1.8 times length of terminal segment of antennular trunk. Eyestalk without ocular papilla; length 0.7-0.8 times its width at conjunction with cornea. Rostrum triangular with acute to narrowly-rounded apex and with concave, up-tilted lateral margins; rostrum 0.8-1.0 times as long as terminal segment of antennular trunk.
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</paragraph>
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<paragraph pageId="0" pageNumber="145">
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<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Antennae</emphasis>
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s.l. (Figs
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8C, D</figureCitation>
|
||
,
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10A-C</figureCitation>
|
||
). Terminal segment of antennular trunk with mid-ventral lobe (Figs
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8D</figureCitation>
|
||
,
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10B</figureCitation>
|
||
) bearing modified setae in females (Fig.
|
||
<figureCitation captionStart="Figure 25" captionStartId="F25" captionText="Figure 25. Surface details of appendix masculina and its female homologue in series of increasing body size for Mysidetes illigi (A-C) and M. hanseni (D) from Antarctic ice caves. A immature male BL 12.1 mm B subadult male 14.7 mm C adult female 18.4 mm D adult male 24.7 mm." figureDoi="10.3897/zookeys.1079.76412.figure25" httpUri="https://binary.pensoft.net/fig/629335" pageId="0" pageNumber="145">25C</figureCitation>
|
||
). Antennal sympod (Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10C</figureCitation>
|
||
) with one large, acute tooth on disto-lateral edge and more caudally an additional shorter tooth. Dorsal face of sympod with triangular, apically rounded lobe. Antennal scale two-segmented, apically rounded, setose all around, with apical segment only 2% total scale length; scale 4-7 times as long as its maximum width; scale projects 0.3-0.6 times its length beyond antennular trunk.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Mouthparts</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">11</figureCitation>
|
||
). Median segment of mandibular palp 2.5-3.3 times as long as maximum width (Fig.
|
||
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">11B</figureCitation>
|
||
), densely setose all around. Right mandible with digitus mobilis and pars centralis modified as in Fig.
|
||
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">11B</figureCitation>
|
||
; remaining mouthparts normal, labrum not produced rostrally, maxilla without spines.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Thorax</emphasis>
|
||
(Figs
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10D-K</figureCitation>
|
||
,
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13A, B</figureCitation>
|
||
) without mid-sternal processes in females and non-adult males. Flagellum of thoracic exopods 1, 8 with eight segments, flagella 2-7 with nine segments (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13A</figureCitation>
|
||
). Carpopropodus of thoracic endopods 1-8 with 2, 2, 5-6, 6-8, 7-9, 6-9, 6-8 and 6-8 segments, respectively. Claw of endopod 1 (Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10F</figureCitation>
|
||
) strong, subapically, unilaterally, weakly serrated; claws 3-8 (Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10H-K</figureCitation>
|
||
) weak, slender, smooth. Marsupium formed by two pairs of large oostegites; additional rudimentary oostegite on thoracopod 6 (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13A</figureCitation>
|
||
). Subadult males with penes (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13B</figureCitation>
|
||
) stiff, slender, 1-2 times length of ischium of endopod 8.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Pleon</emphasis>
|
||
(Figs
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8A</figureCitation>
|
||
,
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13B-G</figureCitation>
|
||
). Pleopods (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13C-G</figureCitation>
|
||
) reduced to unsegmented, setose plates with comparatively large endopodal portion (pseudobranchial lobe) integrated. All pleopods without spines, no modified setae. Total length increases in series of pleopods 1 to 5.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Tail fan</emphasis>
|
||
(Figs
|
||
<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E), 18.4 mm (B) A head, lateral B anterior body region, dorsal, dashed line enhances the anterior contour of carapace C paired circular structures symmetrically arranged in front of posterior margin of carapace D series of cuticle structures parallel to lateral margin of carapace E tail fan, lateral." figureDoi="10.3897/zookeys.1079.76412.figure9" httpUri="https://binary.pensoft.net/fig/629319" pageId="0" pageNumber="145">9E</figureCitation>
|
||
,
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13H, I</figureCitation>
|
||
). Endopod of uropods (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13H</figureCitation>
|
||
) with 8-13 slender spines in series from statocyst to 25-35% endopod length from apex; proximal 2-4 spines short, in part crowded; remaining 6-9 spines longer, subequal amongst each other, about equally spaced in linear series. Telson (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13I</figureCitation>
|
||
) trapezoid, length 1.9-2.5 times maximum width near basis and 6-7 times minimum width on bifid terminus. Length 0.7-0.8 times exopod of uropod. Lateral margins of telson each with total of 35-47 spines; basal portions with 7-9 spines in continuous series followed by an unarmed stretch, median portions start with 2-6 spines increasing in length distally, followed up to tip by discontinuous series of large spines with small spines in between. Cleft U-shaped, penetrating 15-18% telson length, margin of cleft lined all along with 23-29 laminae of which proximal 3-4 laminae larger than remaining 20-25 subequal laminae. Cleft 2.0-2.5 times as deep as its width at apex. Disto-lateral lobes of telson triangular with narrowly truncate apex; each lobe armed with two spines at apex, mesial spine 0.5-0.7 times length of lateral spine.
|
||
</paragraph>
|
||
<caption doi="10.3897/zookeys.1079.76412.figure7" httpUri="https://binary.pensoft.net/fig/629317" pageId="0" pageNumber="145" start="Figure 7" startId="F7">
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Figure 7.</emphasis>
|
||
<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes illigi</emphasis>
|
||
</taxonomicName>
|
||
from ice cave of Bernard Island, Antarctica
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
subadult male, dorsal
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
subadult male, lateral
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
hyperbenthic association formed by mysids and early stages of nothotheniid fish
|
||
<emphasis bold="true" pageId="0" pageNumber="145">D</emphasis>
|
||
fish swarm mixed with small number of mysids several metres inside cave
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A, B</emphasis>
|
||
, living specimens in laboratory.
|
||
</paragraph>
|
||
</caption>
|
||
</subSubSection>
|
||
<subSubSection pageId="0" pageNumber="145" type="description">
|
||
<paragraph pageId="0" pageNumber="145">Description of holotype.</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
Subadult female (Fig.
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8</figureCitation>
|
||
) with 12.7 mm body length, not dissected. Status of ovarian tubes not well established. Body moderately slender, pleon (without telson) contributes 59% to total trunk length. Carapace including rostrum 32% of body length (including telson) when measured along dorsal mid-line.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Cephalothorax</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8B-D</figureCitation>
|
||
). Outer lobe from basal segment of antennular trunk extending beyond median segment. Basally wide, low lobe located mid-ventrally closely behind anterior margin of terminal segment (arrows in Fig.
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8D</figureCitation>
|
||
). Antennal sympod as in diagnosis (as in Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10C</figureCitation>
|
||
). Scale is 3.8-4.3 times as long as its maximum width (Fig.
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8C</figureCitation>
|
||
), extending 46-59% its length beyond antennular trunk and 35-47% beyond antennal peduncle. Basal segment contributing 20-24% to length of antennal peduncle, median segment 45-46%, and distal segment 30-34%. Cornea large, bulbous (damaged in this specimen). Eyestalk smooth, no ocular papilla. Frons with five horizontal bulges vertically stacked between rostrum and antennular symphysis, these ranging from subrostral process (bulge) ventrally down to that from the antennular symphysis. Rostrum (Fig.
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8A, B</figureCitation>
|
||
) large, triangular, basally broad, extending to terminal margin of eyestalks or beyond, depending on orientation of eyestalks. Carapace normal, its disto-lateral edges and its caudo-lateral lobes well-rounded. Carapace leaves ultimate 1.5 thoracomeres dorsally exposed. Median segment of mandibular palp 2.5-2.7 times as long as its maximum width. Flagellum of thoracic exopods 6-7 with nine segments, flagellum 8 with eight segments; all remaining exopods and endopods 3-8 broken.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Pleon</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Holotype of Mysidetes illigi, subadult female BL 12.7 mm A body, lateral, most thoracic endopods broken (specimen artificially separated from background) B anterior body region, dorsal, cuticle lifted from cornea as fixation artefact C cephalic region, ventral D detail of (C) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina)." figureDoi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145">8A</figureCitation>
|
||
). Pleonites 1-5 are 0.8, 0.7, 0.6, 0.6 and 0.5 times length of pleonite 6, respectively. Pleopods as in diagnosis (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13C-E</figureCitation>
|
||
). Exopod of uropods extends 31% its length beyond telson. Both endopods with broken tip. Slender, about equally-spaced spines along remainder of endopods; potential spines near statocyst not visible without dissection. Statolith diameter 0.27 mm.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Telson</emphasis>
|
||
trapezoid, 1.2 times length of ultimate pleonite, 1.9 times as long as maximum width near basis. Right margin of cleft lined by eleven laminae, amongst which ten distal laminae short, subequal. Bottom of cleft with three larger laminae, i.e. median lamina flanked by two submedian laminae (including the proximal one on right margin). Left disto-lateral lobe of telson distally broken. Corresponding right lobe triangular with narrowly truncate apex armed with two spines, the mesial spine 2/3 length of the lateral spine. Right lateral margin of telson almost straight, with total of 35 spines. Basal portion of both margins with 7-8 spines in continuous series, followed by unarmed stretch, median portion with 3-4 spines increasing in length distally; this series distally continued by discontinuous series of large spines with small spines in between, in the right margin up to the tip, left margin distally broken.
|
||
</paragraph>
|
||
<caption doi="10.3897/zookeys.1079.76412.figure8" httpUri="https://binary.pensoft.net/fig/629318" pageId="0" pageNumber="145" start="Figure 8" startId="F8">
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Figure 8.</emphasis>
|
||
Holotype of
|
||
<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes illigi</emphasis>
|
||
</taxonomicName>
|
||
, subadult female BL 12.7 mm
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
body, lateral, most thoracic endopods broken (specimen artificially separated from background)
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
anterior body region, dorsal, cuticle lifted from cornea as fixation artefact
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
cephalic region, ventral
|
||
<emphasis bold="true" pageId="0" pageNumber="145">D</emphasis>
|
||
detail of (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
) showing distal margin of right antennular trunk, arrows point to mid-dorsal lobe (female antennular lobe = derivate of appendix masculina).
|
||
</paragraph>
|
||
</caption>
|
||
</subSubSection>
|
||
<subSubSection pageId="0" pageNumber="145" type="description">
|
||
<paragraph pageId="0" pageNumber="145">Description of adult females from ice caves.</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">First description of adult females; all features as given in diagnosis. General appearance moderately slender, body length 14.2-18.4 mm (n = 8). Rostrum measures 3-4% body length, thorax 33-34%, pleon 48-49%, telson 14-16% and carapace, including rostrum, 29-32%. Pleon (without telson) contributes 54-59% to trunk length. Frons with 4-5 vertically stacked, horizontal bulges, these ranging from subrostral process (bulge) ventrally down to that from antennular symphysis.</paragraph>
|
||
<caption doi="10.3897/zookeys.1079.76412.figure9" httpUri="https://binary.pensoft.net/fig/629319" pageId="0" pageNumber="145" start="Figure 9" startId="F9">
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Figure 9.</emphasis>
|
||
<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes illigi</emphasis>
|
||
</taxonomicName>
|
||
from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C-E</emphasis>
|
||
), 18.4 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
)
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
head, lateral
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
anterior body region, dorsal, dashed line enhances the anterior contour of carapace
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
paired circular structures symmetrically arranged in front of posterior margin of carapace
|
||
<emphasis bold="true" pageId="0" pageNumber="145">D</emphasis>
|
||
series of cuticle structures parallel to lateral margin of carapace
|
||
<emphasis bold="true" pageId="0" pageNumber="145">E</emphasis>
|
||
tail fan, lateral.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Carapace</emphasis>
|
||
(Figs
|
||
<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E), 18.4 mm (B) A head, lateral B anterior body region, dorsal, dashed line enhances the anterior contour of carapace C paired circular structures symmetrically arranged in front of posterior margin of carapace D series of cuticle structures parallel to lateral margin of carapace E tail fan, lateral." figureDoi="10.3897/zookeys.1079.76412.figure9" httpUri="https://binary.pensoft.net/fig/629319" pageId="0" pageNumber="145">9B-D</figureCitation>
|
||
,
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10D</figureCitation>
|
||
) with normal gross structure, no apparent sexual dimorphism. Rostrum covering basal portions of normally orientated eyestalks, reaching at most to distal margin of artificially straight forward-orientated eyestalks (without cornea). Carapace with disto-lateral edges and caudo-lateral lobes well-rounded. Terminal margin leaving ultimate 1.5-2.5 thoracomeres mid-dorsally exposed. Cervical sulcus strong, cardial sulcus feebly developed. Group of about 30 pores (as in Fig.
|
||
<figureCitation captionStart="Figure 17" captionStartId="F17" captionText="Figure 17. Mysidetes hanseni from ice cave of Curie Islands, Antarctica. Adult male BL 24.7 mm (A, C-F, I, J), adult female 23.4 mm (B, G, H, K-M) A right male antennula, dorsal B distal margin of left female antennular trunk, ventral, flagella omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide, details show cervical (E) and cardial (F) pore groups G-K tarsus in series of thoracic endopods 2 - 5, 8, setae omitted L tergite expanded on slide together with pleurites of pleomere 1, setae of pleopods omitted, detail (M) shows transverse pore groups. E, F, M, pore diameters not to scale." figureDoi="10.3897/zookeys.1079.76412.figure17" httpUri="https://binary.pensoft.net/fig/629327" pageId="0" pageNumber="145">17E</figureCitation>
|
||
) about 1/9 carapace length in front of cervical sulcus and transverse series of about 40 pores (as in Fig.
|
||
<figureCitation captionStart="Figure 17" captionStartId="F17" captionText="Figure 17. Mysidetes hanseni from ice cave of Curie Islands, Antarctica. Adult male BL 24.7 mm (A, C-F, I, J), adult female 23.4 mm (B, G, H, K-M) A right male antennula, dorsal B distal margin of left female antennular trunk, ventral, flagella omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide, details show cervical (E) and cardial (F) pore groups G-K tarsus in series of thoracic endopods 2 - 5, 8, setae omitted L tergite expanded on slide together with pleurites of pleomere 1, setae of pleopods omitted, detail (M) shows transverse pore groups. E, F, M, pore diameters not to scale." figureDoi="10.3897/zookeys.1079.76412.figure17" httpUri="https://binary.pensoft.net/fig/629327" pageId="0" pageNumber="145">17F</figureCitation>
|
||
) along cardial sulcus (Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10D</figureCitation>
|
||
shows fewer pores due to limited graphical resolution). An unusual set of cuticle structures is present: two pairs of circular structures (Fig.
|
||
<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E), 18.4 mm (B) A head, lateral B anterior body region, dorsal, dashed line enhances the anterior contour of carapace C paired circular structures symmetrically arranged in front of posterior margin of carapace D series of cuticle structures parallel to lateral margin of carapace E tail fan, lateral." figureDoi="10.3897/zookeys.1079.76412.figure9" httpUri="https://binary.pensoft.net/fig/629319" pageId="0" pageNumber="145">9C</figureCitation>
|
||
) symmetrically arranged in front of the posterior margin (Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10D</figureCitation>
|
||
). Cuticle sculptured by minute depressions with crescent-shaped margins (Fig.
|
||
<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E), 18.4 mm (B) A head, lateral B anterior body region, dorsal, dashed line enhances the anterior contour of carapace C paired circular structures symmetrically arranged in front of posterior margin of carapace D series of cuticle structures parallel to lateral margin of carapace E tail fan, lateral." figureDoi="10.3897/zookeys.1079.76412.figure9" httpUri="https://binary.pensoft.net/fig/629319" pageId="0" pageNumber="145">9D</figureCitation>
|
||
), loosely and irregularly arranged in transverse series behind fold delimiting up-tilted anterior portion of carapace, behind cardial sulcus; series also extending short distance along posterior 2/3 of lateral margins (sculptures omitted in Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10D</figureCitation>
|
||
). Outer surface of carapace smooth, except for the here-described structures.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Eyes</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E), 18.4 mm (B) A head, lateral B anterior body region, dorsal, dashed line enhances the anterior contour of carapace C paired circular structures symmetrically arranged in front of posterior margin of carapace D series of cuticle structures parallel to lateral margin of carapace E tail fan, lateral." figureDoi="10.3897/zookeys.1079.76412.figure9" httpUri="https://binary.pensoft.net/fig/629319" pageId="0" pageNumber="145">9A, B</figureCitation>
|
||
). Eyestalks and cornea dorsoventrally not or only slightly compressed. In dorsal view, cornea appears calotte-shaped, in lateral view oviform to spherical. Stalk mesially near basis with hispid bulge, remaining (= major) portions with smooth cuticle.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Antennulae</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10A, B</figureCitation>
|
||
). Trunk measures 8-9% body length extending 0.3-0.5 times its length beyond eyes and is 2.2-3.2 times longer than its maximum width. Segments 1-3 measure 46-48%, 18-19% and 34-37% length of antennular trunk, respectively. Lateral lobe from basal segment extends beyond median segment. Median segment with its mesial face not inflated. Terminal segment 0.7-0.9 times as long as wide. Its mid-dorsal apophysis with 3-4 barbed setae, with small cilia lining the disto-mesial margin; no spiniform anterior projection. Lateral antennular flagellum in adult females 1.2-1.4 times width of the mesial flagellum when measured near basis of flagella.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Antennae</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10C</figureCitation>
|
||
). Sympod caudally with bulbous lobe containing end sac of antennal gland. The three-segmented peduncle with basal segment 20-23% peduncle length, second 43-46% and third 33-36%, respectively. Third segment 1.1-1.6 times as long as wide. Antennal scale with convex mesial margin; lateral margin slightly sigmoid, almost straight. Small apical segment with five plumose setae.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Mandibles</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">11B</figureCitation>
|
||
). Segments 1-3 contribute 9-12%, 56-64% and 26-32%, respectively, to total length of three-segmented palp. Proximal segment of palp without setae. Median segment 2.8-3.5 times as long as maximum width, both margins setose all along. Terminal segment strongly setose along mesial margin; distal 3/4 in addition with series of shorter setae on rostral face. Left mandible essentially normal, right mandible with modified teeth on pars centralis. Pars incisiva of left mandible with 4-5 large teeth plus a few very small teeth, its digitus mobilis strong, with 3-4 teeth and its pars centralis with four separate, spiny teeth. Pars incisiva of right mandible with 4-5 large teeth, digitus mobilis small with one large and 5-6 very small teeth, pars centralis distally with two separate spiny teeth and proximally with 5-7 acute teeth projecting from a common basis. Pars molaris with well-developed grinding surface in both mandibles; part of grinding lamellae with minute teeth.
|
||
</paragraph>
|
||
<caption doi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145" start="Figure 10" startId="F10">
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Figure 10.</emphasis>
|
||
<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes illigi</emphasis>
|
||
</taxonomicName>
|
||
from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
) 18.1 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">D</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">K</emphasis>
|
||
) 17.3 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
), 18.4 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">E-J</emphasis>
|
||
).
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
right antennula, dorsal
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
antenna with antennal gland, dorsal, setae omitted from antennal scale
|
||
<emphasis bold="true" pageId="0" pageNumber="145">D</emphasis>
|
||
carapace expanded on slide
|
||
<emphasis bold="true" pageId="0" pageNumber="145">E</emphasis>
|
||
<normalizedToken originalValue="‘tarsus’">'tarsus'</normalizedToken>
|
||
of thoracic endopod 1, caudal, setae omitted, detail (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">F</emphasis>
|
||
) shows claw
|
||
<emphasis bold="true" pageId="0" pageNumber="145">G-K</emphasis>
|
||
series of tarsus 2-5, 8, setae omitted.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Labrum and labium</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">11A, C</figureCitation>
|
||
). Caudal face of labrum with field of small, stiff bristles to left and with rugged, spiny area, also with stiff bristles to right. Densely setose field on posterior half of oral (= dorsal) face. Labium normal, comprising two hairy lobes with short, dense set of stiff bristles on distal half of mesial face.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Maxillula</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">11D</figureCitation>
|
||
). Distal segment of maxillula terminally with 11-15 strong spines, most of which are serrated by small denticles in median portions. No such denticles on the largest spines in innermost (mesial) position, weak or no denticles on the spine in outermost (lateral) position. Distal segment subterminally with 7-9 barbed setae, furnished with comparatively long barbs along their median third and minute barbs in comb-like arrangement along distal third; about 8-11 pores beneath basis of outermost seta. Endite of maxillula terminally with three distally-spiny setae, flanked by 2-4 proximally thick barbed setae; mesial and lateral margins of endite with numerous less thick setae; innermost (mesial) seta longest, projecting mesially.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Maxilla</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">11E</figureCitation>
|
||
) normal, densely setose, with various types of setae, but no spines or teeth. Mesial margin of sympod with 1 (2) basally thick seta, barbed in central portions, microserrated by minute stiff bristles along distal third; slightly or not extending beyond dense brush of barbed setae. Terminal segment of endopod plus sympod and all three large endites of sympod, with densely setose distal margins. Basal segment of endopod with three basally thick, barbed setae (below drawing plane in Fig.
|
||
<figureCitation captionStart="Figure 11" captionStartId="F11" captionText="Figure 11. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (A, C, E), 18.1 mm (B, D) A labrum, ventral aspect B mandibles with right palp, rostral C labium D maxillula, caudal E maxilla, caudal." figureDoi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145">11E</figureCitation>
|
||
). Terminal segment 1.4-1.7 times longer than wide. The setae along its lateral margin slender, sparsely barbed near basis, not resembling spines. Leaf-like exopod extends shortly beyond the distal margin of basal segment of endopod. Exopod with 32-37 barbed setae all along lateral margin, the subapical setae on inner margin longest, the neighbouring apical seta second longest, both longer and thicker than the remaining ones (all located on outer margin).
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Foregut</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Cardiac portion of foregut in Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult female BL 18.1 mm A foregut in dorsal view, food removed from right half, lower-case labels indicate dorsolateral infoldings (di), lateralia (la), mid-gut (mg) and storage space (sp) B spine group from dorsolateral infoldings C spinose lobe of posterior part of lateralia D, E spines from median portions of lateralia." figureDoi="10.3897/zookeys.1079.76412.figure12" httpUri="https://binary.pensoft.net/fig/629322" pageId="0" pageNumber="145">12</figureCitation>
|
||
). Lateralia mostly covered by smooth acute spines, apically pronged spines (Fig.
|
||
<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Cardiac portion of foregut in Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult female BL 18.1 mm A foregut in dorsal view, food removed from right half, lower-case labels indicate dorsolateral infoldings (di), lateralia (la), mid-gut (mg) and storage space (sp) B spine group from dorsolateral infoldings C spinose lobe of posterior part of lateralia D, E spines from median portions of lateralia." figureDoi="10.3897/zookeys.1079.76412.figure12" httpUri="https://binary.pensoft.net/fig/629322" pageId="0" pageNumber="145">12E</figureCitation>
|
||
) and fewer apically forked spines (Fig.
|
||
<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Cardiac portion of foregut in Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult female BL 18.1 mm A foregut in dorsal view, food removed from right half, lower-case labels indicate dorsolateral infoldings (di), lateralia (la), mid-gut (mg) and storage space (sp) B spine group from dorsolateral infoldings C spinose lobe of posterior part of lateralia D, E spines from median portions of lateralia." figureDoi="10.3897/zookeys.1079.76412.figure12" httpUri="https://binary.pensoft.net/fig/629322" pageId="0" pageNumber="145">12D</figureCitation>
|
||
), the two latter spine-types with minute spinules along their shaft. Posterior part of lateralia on each side of foregut with lobe bearing dense set of 5-7 unilaterally serrated spines (Fig.
|
||
<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Cardiac portion of foregut in Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult female BL 18.1 mm A foregut in dorsal view, food removed from right half, lower-case labels indicate dorsolateral infoldings (di), lateralia (la), mid-gut (mg) and storage space (sp) B spine group from dorsolateral infoldings C spinose lobe of posterior part of lateralia D, E spines from median portions of lateralia." figureDoi="10.3897/zookeys.1079.76412.figure12" httpUri="https://binary.pensoft.net/fig/629322" pageId="0" pageNumber="145">12C</figureCitation>
|
||
). Dorsolateral infoldings on each side with 5-6 spines decreasing in length dorsally-medially, unilaterally serrated in median to subapical portions (Fig.
|
||
<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Cardiac portion of foregut in Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult female BL 18.1 mm A foregut in dorsal view, food removed from right half, lower-case labels indicate dorsolateral infoldings (di), lateralia (la), mid-gut (mg) and storage space (sp) B spine group from dorsolateral infoldings C spinose lobe of posterior part of lateralia D, E spines from median portions of lateralia." figureDoi="10.3897/zookeys.1079.76412.figure12" httpUri="https://binary.pensoft.net/fig/629322" pageId="0" pageNumber="145">12B</figureCitation>
|
||
). Foregut not covered by pigment bodies.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Thoracic sternites</emphasis>
|
||
.
|
||
</emphasis>
|
||
Sternite 1 anteriorly produced into an anterior lobe contributing to the caudal closure of the mouth field as usual in
|
||
<taxonomicName authorityName="Haworth" authorityYear="1825" class="Malacostraca" family="Mysidae" kingdom="Animalia" lsidName="" order="Mysida" pageId="0" pageNumber="145" phylum="Arthropoda" rank="family">Mysidae</taxonomicName>
|
||
. Pair of comparatively large barbed setae on intersegmental joint between thoracic sternite 2 and sympod 2. No such setae on sternites 1 and 3-8.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Thoracopods general</emphasis>
|
||
(Figs
|
||
<figureCitation captionStart="Figure 10" captionStartId="F10" captionText="Figure 10. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 17.9 mm (A) 18.1 mm (B, D, K) 17.3 mm (C), 18.4 mm (E-J). A right antennula, dorsal B distal margin of left antennular trunk, ventral, arrow points to mid-dorsal lobe (derivate of appendix masculina), flagellae omitted C antenna with antennal gland, dorsal, setae omitted from antennal scale D carapace expanded on slide E ' tarsus' of thoracic endopod 1, caudal, setae omitted, detail (F) shows claw G-K series of tarsus 2 - 5, 8, setae omitted." figureDoi="10.3897/zookeys.1079.76412.figure10" httpUri="https://binary.pensoft.net/fig/629320" pageId="0" pageNumber="145">10E-K</figureCitation>
|
||
,
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13A</figureCitation>
|
||
). Length increasing from exopod 1 to 3, remaining subequal from 3 to 7 and decreasing from 7 to 8. Length of flagella 1.8-2.3 times length of basal plates (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13A</figureCitation>
|
||
). Exopods with basal plates laterally expanded; length of plates 1.9-2.3 times maximum width. Disto-lateral edge of plates angular, tip rounded to varying degrees. Endopods 5-8 long and slender. Ischium becomes increasingly slender from endopods 1 to 5. Length of ischium increasing from endopods 1 to 5, remaining subequal amongst endopods 5-8. Ischium shorter than merus in endopods 1-4, but longer than merus in endopods 5-8. Dactyli of endopods 1-2 larger than those of endopods 3-4, these latter larger than those of 5-8. Claw 1 strong, weakly bent; claw 2 not developed; claws 3-4 needle-like and shorter than claw 1; claws 5-8 distinctly or indistinctly curved, shorter than claw 3. The first thoracopods with large, leaf-like, smooth epipod.
|
||
</paragraph>
|
||
<caption doi="10.3897/zookeys.1079.76412.figure11" httpUri="https://binary.pensoft.net/fig/629321" pageId="0" pageNumber="145" start="Figure 11" startId="F11">
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Figure 11.</emphasis>
|
||
<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes illigi</emphasis>
|
||
</taxonomicName>
|
||
from ice cave of Bernard Island, Antarctica. Adult females BL 18.4 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">E</emphasis>
|
||
), 18.1 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">D</emphasis>
|
||
)
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
labrum, ventral aspect
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
mandibles with right palp, rostral
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
labium
|
||
<emphasis bold="true" pageId="0" pageNumber="145">D</emphasis>
|
||
maxillula, caudal
|
||
<emphasis bold="true" pageId="0" pageNumber="145">E</emphasis>
|
||
maxilla, caudal.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Maxillipeds</emphasis>
|
||
.
|
||
</emphasis>
|
||
Coxa of maxilliped 1 (thoracic endopod 1) with small endite bearing one barbed seta at its tip. This seta extends across mid-line, thus setae from left and right endite slightly overlapping. Basis with large, prominent endite densely setose on mesial margin. Ischium and merus each with one smaller, but distinct, medially setose endite. Basis of maxilliped 2 (endopod 2) with setose, medially projecting endite. Combined praeischium plus ischium 0.6-0.7 times merus length. Combined carpopropodus plus dactylus measure 1.2-1.3 times merus. Dactylus very large, with dense brush formed by large numbers of normal setae and 14-19 modified setae, the latter apically bent, bearing two symmetrical series of denticles (stiff barbs) on either side in sub-basal to median portions.
|
||
</paragraph>
|
||
<caption doi="10.3897/zookeys.1079.76412.figure12" httpUri="https://binary.pensoft.net/fig/629322" pageId="0" pageNumber="145" start="Figure 12" startId="F12">
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Figure 12.</emphasis>
|
||
Cardiac portion of foregut in
|
||
<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes illigi</emphasis>
|
||
</taxonomicName>
|
||
from ice cave of Bernard Island, Antarctica. Adult female BL 18.1 mm
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
foregut in dorsal view, food removed from right half, lower-case labels indicate dorsolateral infoldings (
|
||
<emphasis italics="true" pageId="0" pageNumber="145">di</emphasis>
|
||
), lateralia (
|
||
<emphasis italics="true" pageId="0" pageNumber="145">la</emphasis>
|
||
), mid-gut (
|
||
<emphasis italics="true" pageId="0" pageNumber="145">mg</emphasis>
|
||
) and storage space (
|
||
<emphasis italics="true" pageId="0" pageNumber="145">sp</emphasis>
|
||
)
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
spine group from dorsolateral infoldings
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C</emphasis>
|
||
spinose lobe of posterior part of lateralia
|
||
<emphasis bold="true" pageId="0" pageNumber="145">D, E</emphasis>
|
||
spines from median portions of lateralia.
|
||
</paragraph>
|
||
</caption>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Marsupium</emphasis>
|
||
.
|
||
</emphasis>
|
||
Thoracopods 7 and 8 with large oostegites 1, 2, respectively. Each oostegite without setae on upper (dorsal) margin. Ventral margin and part of posterior margin, from sub-basal region up to rounded tip, with dense series of plumose setae, together with bilaterally opposite oostegite forming gate contributing to ventral and caudal closure of marsupium. Basal portions of marsupium inside with comparatively long setae, microserrated on their distal half. Oostegite 1 near basis with about 20 microserrated setae, oostegite 2 with about 8-10. No setae on outer face of marsupium. Thoracopod 6 with rudimentary oostegite (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13A</figureCitation>
|
||
) represented by small, rounded, smooth lobe bearing 10-13 smooth setae (n = 2) on terminal margin. This rudiment not contributing to wall of brood chamber.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Pleon</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13C-E</figureCitation>
|
||
). Pleonites 1-5 are 0.6, 0.5-0.7, 0.5-0.6, 0.6-0.7 and 0.6-0.7 times the length of pleonite 6, respectively; thus combined pleonites 4, 5 longer than pleonite 6. No pores found on tergites. Length and slenderness of exopodal portion increasing from first to fifth pleopods. By contrast, thickness of exopodal portion and length of endopodal portion decreasing in this direction (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13C-E</figureCitation>
|
||
). Scutellum paracaudale subtriangular, terminally well rounded.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" italics="true" pageId="0" pageNumber="145">Tail fan</emphasis>
|
||
(Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13H, I</figureCitation>
|
||
). Exopod of uropods 1.3-1.5 times length of endopod and 1.4-2.0 times telson, endopod 1.0-1.3 times telson. Exopod extends 0.2-0.4 times its length beyond endopod and 0.3-0.8 times beyond telson, endopod 0.1-0.3 times its length beyond telson (partly due to telson inserting more rostrally). Exopod of uropods with slightly sigmoid, almost straight lateral margin and clearly convex mesial margin. Endopod with proximal four spines discontinuously increasing in length distally; distally followed by 6-9 longer and more slender spines, subequal amongst each other. Endopod basally with large statocyst containing one egg-shaped, irregularly-discoid statolith with partly moruloid surface, diameter 208-213
|
||
<normalizedToken originalValue="µm">µm</normalizedToken>
|
||
, height 90-98
|
||
<normalizedToken originalValue="µm">µm</normalizedToken>
|
||
(n = 6 statoliths from four specimens). Statoliths discoidal, composed of the mineral fluorite. Statolith formula (3-4) + (1-2) + (4-7) + (6-9) + (4-9) = 19-25. Telson (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13I</figureCitation>
|
||
) 1.2-1.4 times length of ultimate pleonite. Its lateral margins slightly sigmoid, almost straight.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection pageId="0" pageNumber="145" type="notes on non-adult males">
|
||
<paragraph pageId="0" pageNumber="145">Notes on non-adult males.</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
Immature males are recognised by knob-like appendix masculina with setae bases present, but not yet bearing setae (Fig.
|
||
<figureCitation captionStart="Figure 25" captionStartId="F25" captionText="Figure 25. Surface details of appendix masculina and its female homologue in series of increasing body size for Mysidetes illigi (A-C) and M. hanseni (D) from Antarctic ice caves. A immature male BL 12.1 mm B subadult male 14.7 mm C adult female 18.4 mm D adult male 24.7 mm." figureDoi="10.3897/zookeys.1079.76412.figure25" httpUri="https://binary.pensoft.net/fig/629335" pageId="0" pageNumber="145">25A</figureCitation>
|
||
). Subadult males by appendix up to half the length of terminal segment of antennular trunk, in part with short setae (Fig.
|
||
<figureCitation captionStart="Figure 25" captionStartId="F25" captionText="Figure 25. Surface details of appendix masculina and its female homologue in series of increasing body size for Mysidetes illigi (A-C) and M. hanseni (D) from Antarctic ice caves. A immature male BL 12.1 mm B subadult male 14.7 mm C adult female 18.4 mm D adult male 24.7 mm." figureDoi="10.3897/zookeys.1079.76412.figure25" httpUri="https://binary.pensoft.net/fig/629335" pageId="0" pageNumber="145">25B</figureCitation>
|
||
). Penes (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13B</figureCitation>
|
||
) slender, large, already reaching to thoracic sternites 4-5 in immature males (body size 12-13 mm, n = 2), to sternite 4 up to the maxillula in subadults (11-15 mm, n = 8). No spermatozoa seen inside penes. Pleopods of subadult males (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13F, G</figureCitation>
|
||
) with same structure and almost same size as in adult females (Fig.
|
||
<figureCitation captionStart="Figure 13" captionStartId="F13" captionText="Figure 13. Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (A, C-E, H), 18.4 mm (I); subadult males 13.7 mm (B), 13.1 mm (F, G). A thoracopod 6 including rudimentary oostegite B penis of subadult male C-E series of female pleopods 1, 3, 5 F, G pleopods 4, 5 in subadult male H uropods dorsal, setae omitted I telson. C-G, many setae broken." figureDoi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145">13C-E</figureCitation>
|
||
). No adult males available.
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection pageId="0" pageNumber="145" type="gut contents">
|
||
<paragraph pageId="0" pageNumber="145">Gut contents.</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
Five adult females (♀0-) and five subadult males inspected in this respect with 30-70% foregut volume filled with largely masticated organic material (debris) plus varying amounts of mineral particles; additional three females (♀0-) with empty foregut. Abundant detritus and mineral particles are visible in Fig.
|
||
<figureCitation captionStart="Figure 12" captionStartId="F12" captionText="Figure 12. Cardiac portion of foregut in Mysidetes illigi from ice cave of Bernard Island, Antarctica. Adult female BL 18.1 mm A foregut in dorsal view, food removed from right half, lower-case labels indicate dorsolateral infoldings (di), lateralia (la), mid-gut (mg) and storage space (sp) B spine group from dorsolateral infoldings C spinose lobe of posterior part of lateralia D, E spines from median portions of lateralia." figureDoi="10.3897/zookeys.1079.76412.figure12" httpUri="https://binary.pensoft.net/fig/629322" pageId="0" pageNumber="145">12A</figureCitation>
|
||
(content artificially removed from the right half of this foregut).
|
||
</paragraph>
|
||
</subSubSection>
|
||
<subSubSection pageId="0" pageNumber="145" type="distribution">
|
||
<paragraph pageId="0" pageNumber="145">Colour and microdistribution.</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
Live colour was documented in the laboratory (Fig.
|
||
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Mysidetes illigi from ice cave of Bernard Island, Antarctica A subadult male, dorsal B subadult male, lateral C hyperbenthic association formed by mysids and early stages of nothotheniid fish D fish swarm mixed with small number of mysids several metres inside cave A, B, living specimens in laboratory." figureDoi="10.3897/zookeys.1079.76412.figure7" httpUri="https://binary.pensoft.net/fig/629317" pageId="0" pageNumber="145">7A, B</figureCitation>
|
||
) and in the field (Fig.
|
||
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Mysidetes illigi from ice cave of Bernard Island, Antarctica A subadult male, dorsal B subadult male, lateral C hyperbenthic association formed by mysids and early stages of nothotheniid fish D fish swarm mixed with small number of mysids several metres inside cave A, B, living specimens in laboratory." figureDoi="10.3897/zookeys.1079.76412.figure7" httpUri="https://binary.pensoft.net/fig/629317" pageId="0" pageNumber="145">7C</figureCitation>
|
||
). Eyestalks, carapace, posterior half of pleomeres and telson densely covered by red pigment spots. Ovarian tubes and brood pouch content red; cornea orange to brown. The animals appear fully red upon
|
||
<normalizedToken originalValue="‘expanded’">'expanded'</normalizedToken>
|
||
chromatophores. Many specimens as in Fig.
|
||
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Mysidetes illigi from ice cave of Bernard Island, Antarctica A subadult male, dorsal B subadult male, lateral C hyperbenthic association formed by mysids and early stages of nothotheniid fish D fish swarm mixed with small number of mysids several metres inside cave A, B, living specimens in laboratory." figureDoi="10.3897/zookeys.1079.76412.figure7" httpUri="https://binary.pensoft.net/fig/629317" pageId="0" pageNumber="145">7C</figureCitation>
|
||
show red cephalothorax and tail fan, but transparent pleomeres 1-5, suggesting a differential
|
||
<normalizedToken originalValue="‘expansion’">'expansion'</normalizedToken>
|
||
of chromatophores as also found in many other
|
||
<taxonomicName authorityName="Haworth" authorityYear="1825" class="Malacostraca" family="Mysidae" kingdom="Animalia" lsidName="" order="Mysida" pageId="0" pageNumber="145" phylum="Arthropoda" rank="family">Mysidae</taxonomicName>
|
||
species. The mysids swam several centimetres to several metres away from the substrate, in part within and close to swarms of early stages (Fig.
|
||
<figureCitation captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Mysidetes illigi from ice cave of Bernard Island, Antarctica A subadult male, dorsal B subadult male, lateral C hyperbenthic association formed by mysids and early stages of nothotheniid fish D fish swarm mixed with small number of mysids several metres inside cave A, B, living specimens in laboratory." figureDoi="10.3897/zookeys.1079.76412.figure7" httpUri="https://binary.pensoft.net/fig/629317" pageId="0" pageNumber="145">7C, D</figureCitation>
|
||
) of the nothotheniid fish
|
||
<taxonomicName lsidName="Pa. borchgrevinki" pageId="0" pageNumber="145" rank="species" species="borchgrevinki">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Pa. borchgrevinki</emphasis>
|
||
</taxonomicName>
|
||
(identification R. Causse, MNHN Paris).
|
||
</paragraph>
|
||
<caption doi="10.3897/zookeys.1079.76412.figure13" httpUri="https://binary.pensoft.net/fig/629323" pageId="0" pageNumber="145" start="Figure 13" startId="F13">
|
||
<paragraph pageId="0" pageNumber="145">
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Figure 13.</emphasis>
|
||
<taxonomicName authorityName="Zimmer" authorityYear="1914" class="Malacostraca" family="Mysidae" genus="Mysidetes" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Mysidetes illigi" order="Mysidacea" pageId="0" pageNumber="145" phylum="Arthropoda" rank="species" species="illigi">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">Mysidetes illigi</emphasis>
|
||
</taxonomicName>
|
||
from ice cave of Bernard Island, Antarctica. Adult females BL 18.1 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C-E</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">H</emphasis>
|
||
), 18.4 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">I</emphasis>
|
||
); subadult males 13.7 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
), 13.1 mm (
|
||
<emphasis bold="true" pageId="0" pageNumber="145">F</emphasis>
|
||
,
|
||
<emphasis bold="true" pageId="0" pageNumber="145">G</emphasis>
|
||
).
|
||
<emphasis bold="true" pageId="0" pageNumber="145">A</emphasis>
|
||
thoracopod 6 including rudimentary oostegite
|
||
<emphasis bold="true" pageId="0" pageNumber="145">B</emphasis>
|
||
penis of subadult male
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C-E</emphasis>
|
||
series of female pleopods 1, 3, 5
|
||
<emphasis bold="true" pageId="0" pageNumber="145">F, G</emphasis>
|
||
pleopods 4, 5 in subadult male
|
||
<emphasis bold="true" pageId="0" pageNumber="145">H</emphasis>
|
||
uropods dorsal, setae omitted
|
||
<emphasis bold="true" pageId="0" pageNumber="145">I</emphasis>
|
||
telson.
|
||
<emphasis bold="true" pageId="0" pageNumber="145">C-G</emphasis>
|
||
, many setae broken.
|
||
</paragraph>
|
||
</caption>
|
||
</subSubSection>
|
||
<subSubSection pageId="0" pageNumber="145" type="distribution">
|
||
<paragraph pageId="0" pageNumber="145">Distribution and type locality.</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
First described from samples below ice at the type locality by monotypy, this is Gauss Station,
|
||
<geoCoordinate degrees="66" direction="south" minutes="02" orientation="latitude" precision="925" value="-66.03333">66°02'S</geoCoordinate>
|
||
,
|
||
<geoCoordinate degrees="89" direction="east" minutes="38" orientation="longitude" precision="925" value="89.63333">89°38'E</geoCoordinate>
|
||
, coast of East Antarctica. Data of
|
||
<bibRefCitation author="Zimmer, C" editor="Drygalski, E von" journalOrPublisher="Georg Reimer, Berlin" pageId="0" pageNumber="145" pagination="377 - 445" refId="B123" refString="Zimmer, C, 1914. Die Schizopoden der deutschen Suedpolar-Expedition 1901-1903. In: Drygalski, E von, Ed., Deutsche Suedpolar-Expedition 1901-1903, XV. Zoologie. Georg Reimer, Berlin 7: 377 - 445" title="Die Schizopoden der deutschen Suedpolar-Expedition 1901 - 1903." volume="7" volumeTitle="Deutsche Suedpolar-Expedition 1901 - 1903, XV. Zoologie." year="1914">Zimmer (1914)</bibRefCitation>
|
||
and
|
||
<bibRefCitation author="Luedecke, C" journalOrPublisher="Oefversigt af Kongliga Vetenskaps-Akademiens Foerhandlingar" pageId="0" pageNumber="145" refId="B48" refString="Luedecke, C, 2013. (2013) Zum Kontinent des eisigen Suedens. Die erste deutsche Suedpolarexpedition 1901-1903 - Erich von Drygalski. Marix Verlag, Wiesbaden 5-414." title="(2013) Zum Kontinent des eisigen Suedens. Die erste deutsche Suedpolarexpedition 1901 - 1903 - Erich von Drygalski. Marix Verlag, Wiesbaden 5 - 414." year="2013">
|
||
<normalizedToken originalValue="Lüdecke">Luedecke</normalizedToken>
|
||
(2013)
|
||
</bibRefCitation>
|
||
combined and refined by present authors:
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Gauss Station</emphasis>
|
||
is the
|
||
<normalizedToken originalValue="‘Winterstation’">'Winterstation'</normalizedToken>
|
||
of the 'Deutsche
|
||
<normalizedToken originalValue="Südpolar-Expedition">Suedpolar-Expedition</normalizedToken>
|
||
1901-1903' about 85 km north of the continental coast, where the research vessel
|
||
<normalizedToken originalValue="‘Gauß’">'Gauss'</normalizedToken>
|
||
was locked in ice and drifting with ice for almost one year. Locality with perennial ice cover, except for transient breaks, fissures and holes. The respective sample was taken in 1902 during the austral summer through an artificial hole in the ice, sampling depth from 200-0 m, bottom depth 385 m.
|
||
</paragraph>
|
||
<paragraph pageId="0" pageNumber="145">
|
||
Our findings are the second published with the original name, obtained upon two diving excursions to an ice cave of
|
||
<emphasis bold="true" pageId="0" pageNumber="145">Bernard Island</emphasis>
|
||
, in 6-10 m depth at
|
||
<geoCoordinate degrees="66" direction="south" minutes="39.64" orientation="latitude" precision="9" value="-66.66067">66°39.64'S</geoCoordinate>
|
||
,
|
||
<geoCoordinate degrees="140" direction="east" minutes="01.55" orientation="longitude" precision="9" value="140.02583">140°01.55'E</geoCoordinate>
|
||
; this is also at the coast of East Antarctica. It is unclear whether and from where this species previously might have been reported as
|
||
<taxonomicName lsidName="M. posthon" pageId="0" pageNumber="145" rank="species" species="posthon">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">M. posthon</emphasis>
|
||
</taxonomicName>
|
||
. The latter taxon was considered the senior synonym of the present species for almost a century, 1923-2021; the taxon
|
||
<taxonomicName lsidName="M. illigi" pageId="0" pageNumber="145" rank="species" species="illigi">
|
||
<emphasis italics="true" pageId="0" pageNumber="145">M. illigi</emphasis>
|
||
</taxonomicName>
|
||
is now reinstalled.
|
||
</paragraph>
|
||
</subSubSection>
|
||
</treatment>
|
||
</document> |