<documentid="02915ABB5CBDC12AC33E6B81177D4972"ID-CLB-Dataset="54097"ID-DOI="10.11646/megataxa.4.1.1"ID-GBIF-Dataset="7c9bc39d-9910-46f1-9558-c0647b9cbbdb"ID-ISSN="2703-3090"ID-Zenodo-Dep="4591138"IM.materialsCitations_approvedBy="felipe"IM.metadata_approvedBy="felipe"IM.tables_approvedBy="jonas"IM.taxonomicNames_approvedBy="jonas"IM.treatments_approvedBy="felipe"checkinTime="1614033145335"checkinUser="plazi"docAuthor="Kim, Il-Hoi & Boxshall, Geoff A."docDate="2020"docId="03C487CBED4E3817FCEFF98FFE57FD26"docLanguage="en"docName="megataxa.4.1.1.pdf.imf"docOrigin="Megataxa 4 (1)"docSource="http://zoobank.org/3fdd970e-62f1-4f67-8cce-10870bdb3c01"docStyle="DocumentStyle:50B6B96D96A55C21793B52C23E95B310.5:Megataxa.2020-.journal_article"docStyleId="50B6B96D96A55C21793B52C23E95B310"docStyleName="Megataxa.2020-.journal_article"docStyleVersion="5"docTitle="Ctenixys pusilla Kim & Boxshall 2020, gen. et sp. nov."docType="treatment"docVersion="11"lastPageNumber="547"masterDocId="FFFDFFB3EF513A35FFC5FFCEFFC5FFC1"masterDocTitle="Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata)"masterLastPageNumber="6"masterPageNumber="1"pageNumber="544"updateTime="1738783121566"updateUser="jonas">
<mods:titleid="9D4AD85E4CB4E61DDB86996E742A9B6B">Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata)</mods:title>
<taxonomicNameid="4C6D4D5EED4E382AFCEFF98FFC2EF99D"ID-CoL="7ZG5T"authority="Kim & Boxshall, 2020"authorityName="Kim & Boxshall"authorityYear="2020"box="[810,1003,1601,1628]"class="Copepoda"family="Notodelphyidae"genus="Ctenixys"kingdom="Animalia"order="Cyclopoida"pageId="543"pageNumber="544"phylum="Arthropoda"rank="species"species="pusilla"status="gen. et sp. nov.">
<taxonomicNameLabelid="A22A57B4ED4E382AFC37F98CFB6CF99D"box="[1010,1193,1602,1628]"pageId="543"pageNumber="544"rank="species">gen. et sp. nov.</taxonomicNameLabel>
<figureCitationid="13562A58ED4E382AFCF7F9ADFC5BF9BC"box="[818,926,1635,1661]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="543"pageNumber="544">Figs. 363</figureCitation>
,
<figureCitationid="13562A58ED4E382AFC6CF9ADFC10F9BF"box="[937,981,1635,1662]"captionStart="FIGURE 364"captionStartId="545.[136,245,1091,1117]"captionTargetBox="[149,1439,242,1017]"captionTargetId="figure-19@545.[136,1451,215,1033]"captionTargetPageId="545"captionText="FIGURE 364. Ctenixys pusilla gen. et sp. nov., female. A, leg 1; B, leg 2; C, leg 3; D, leg 4; E, leg 5. Scale bars: 0.02 mm."figureDoi="http://doi.org/10.5281/zenodo.4592042"httpUri="https://zenodo.org/record/4592042/files/figure.png"pageId="543"pageNumber="544">364</figureCitation>
<figureCitationid="13562A58ED4E382AFB1FF876FA93F812"box="[1242,1366,1976,2003]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="543"pageNumber="544">Fig. 363A</figureCitation>
) stout, inflated; bodylength 1.06 mm. Prosome 882 μmlong; dorsal cephalic shield well-defined, with very small horn-like process posterolaterally on each side. Metasome gradually broadening posteriorly towards rounded margin, unsegmented but with dorsal constriction between pedigerous regions of legs 1 and 2. Freeurosome (
<figureCitationid="13562A58ED703814FF55FA9DFEC6FAAF"box="[144,259,1363,1390]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="545"pageNumber="546">Fig. 363B</figureCitation>
) directed ventrally, perpendicular to prosomal axis, evenly tapering, 5-segmented; articulations between last 3 segments incomplete; surface of anal somite and caudal rami ornamented with setules. Caudal rami (
<figureCitationid="13562A58ED703814FD19FA77FF03FA37"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="545"pageNumber="546">Fig. 363C</figureCitation>
) short, obscurely defined from anal somite, slightly longer than wide (24×21 μm) and about half as long as anal somite, with rounded distal margin; caudal setae indistinguishable from setules.
<taxonomicNameid="4C6D4D5EED713815FEF2F8BAFE29F84F"authority="Kim & Boxshall, 2020"authorityName="Kim & Boxshall"authorityYear="2020"box="[311,492,1908,1934]"class="Copepoda"family="Notodelphyidae"genus="Ctenixys"kingdom="Animalia"order="Cyclopoida"pageId="544"pageNumber="545"phylum="Arthropoda"rank="species"species="pusilla"status="gen. et sp. nov.">
<taxonomicNameid="4C6D4D5EED703814FEF6FB8AFE23FB9C"authority="Kim & Boxshall, 2020"authorityName="Kim & Boxshall"authorityYear="2020"box="[307,486,1091,1118]"class="Copepoda"family="Notodelphyidae"genus="Ctenixys"kingdom="Animalia"order="Cyclopoida"pageId="545"pageNumber="546"phylum="Arthropoda"rank="species"species="pusilla"status="gen. et sp. nov.">
<taxonomicNameLabelid="A22A57B4ED703814FE28FB8DFD5FFB9C"box="[493,666,1091,1117]"pageId="545"pageNumber="546"rank="species">gen. et sp. nov.</taxonomicNameLabel>
</emphasis>
, female. A, leg 1; B, leg 2; C, leg 3; D, leg 4; E, leg 5. Scale bars: 0.02 mm.
<figureCitationid="13562A58ED703814FE8BF925FE79F8C7"box="[334,444,1771,1798]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="545"pageNumber="546">Fig. 363F</figureCitation>
) 3-segmented; coxa and basis unarmed; unsegmented endopod about 3.4 times longer than wide (55×16 μm) and as long as basis: armed with 5 setae (grouped as 1, 1, and 3) plus small terminal claw, aboutone-thirdaslongas endopod.
<figureCitationid="13562A58ED703814FEEDF858FE5BF870"box="[296,414,1942,1969]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="545"pageNumber="546">Fig. 363G</figureCitation>
) semicircular, with few setules. Mandible (
<figureCitationid="13562A58ED703814FECCF876FE46F812"box="[265,387,1976,2003]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="545"pageNumber="546">Fig. 363H</figureCitation>
) with elongate coxal gnathobase terminating in narrow, pectinate medial margin; basis with 1 seta medially; exopod with 4 longer medial setae and 1 short outer seta; first endopodal segment projecting medially and armed with 1 seta; second segment narrow, with 4 smallsetae. Maxillule (
<figureCitationid="13562A58ED703814FB5DFAC1FAC3FAEB"box="[1176,1286,1295,1322]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="545"pageNumber="546">Fig. 363I</figureCitation>
) with 3 setae on arthrite and 1 seta on coxal epipodite; coxal endite absent; exopod and endopod both fused with basis but discernible from each other by marginal notches; regions representing basis, exopod and endopod armed with 1, 4, and 3 setae, respectively. Maxilla (
<figureCitationid="13562A58ED703814FB64FA77FACCFA15"box="[1185,1289,1465,1492]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="545"pageNumber="546">Fig. 363J</figureCitation>
) 3-segmented, comprising syncoxa, basis, and unsegmented endopod; syncoxa bearing 2, 1, and 2 setae on first to third endites, respectively; basis armed only with strong claw bearing 2 rows of spinules distally; endopod small with 3 setae, smallest seta naked, all other setae on maxilla pinnate. Maxilliped (
<figureCitationid="13562A58ED703814FC77F94BFBE1F961"box="[946,1060,1669,1696]"captionStart="FIGURE 363"captionStartId="544.[136,245,1907,1933]"captionTargetBox="[246,1345,211,1845]"captionTargetId="figure-21@544.[208,1379,185,1870]"captionTargetPageId="544"captionText="FIGURE 363. Ctenixys pusilla gen. et sp. nov., female. A, habitus, right; B, leg 5 and urosome, ventral; C, caudal rami, dorsal; D, rostrum; E, antennule; F, antenna; G, labrum; H, mandible; I, maxillule; J, maxilla; K, maxilliped. Scale bars: A, 0.1 mm; B, 0.05 mm; C–J, 0.02 mm; K, 0.01 mm."figureDoi="http://doi.org/10.5281/zenodo.4592040"httpUri="https://zenodo.org/record/4592040/files/figure.png"pageId="545"pageNumber="546">Fig. 363K</figureCitation>
) small, as unsegmented lobe armed distally with 4 or 5 (5 is common) naked setae.
<figureCitationid="13562A58ED703814FC1AF907FB87F925"box="[991,1090,1737,1764]"captionStart="FIGURE 364"captionStartId="545.[136,245,1091,1117]"captionTargetBox="[149,1439,242,1017]"captionTargetId="figure-19@545.[136,1451,215,1033]"captionTargetPageId="545"captionText="FIGURE 364. Ctenixys pusilla gen. et sp. nov., female. A, leg 1; B, leg 2; C, leg 3; D, leg 4; E, leg 5. Scale bars: 0.02 mm."figureDoi="http://doi.org/10.5281/zenodo.4592042"httpUri="https://zenodo.org/record/4592042/files/figure.png"pageId="545"pageNumber="546">Fig. 364</figureCitation>
A–D) reduced in segmentation and setation; inner coxal seta absent. Leg 1 with incompletely 2-segmented rami; basis with large outer seta, but lacking inner distal element. Legs 2–4 with protopod (fused coxa and basis) bearing outer seta and incompletely 2-segmented exopod. Leg 2 endopod rudimentary, knob-like, tipped with 1 seta. Legs 3 and 4 lacking trace of endopod. Armature formula for legs 1–4 as follows:
<figureCitationid="13562A58ED733817FEEFFEB7FE6FFE55"box="[298,426,377,404]"captionStart="FIGURE 364"captionStartId="545.[136,245,1091,1117]"captionTargetBox="[149,1439,242,1017]"captionTargetId="figure-19@545.[136,1451,215,1033]"captionTargetPageId="545"captionText="FIGURE 364. Ctenixys pusilla gen. et sp. nov., female. A, leg 1; B, leg 2; C, leg 3; D, leg 4; E, leg 5. Scale bars: 0.02 mm."figureDoi="http://doi.org/10.5281/zenodo.4592042"httpUri="https://zenodo.org/record/4592042/files/figure.png"pageId="546"pageNumber="547">Fig. 364E</figureCitation>
) represented by 2 unequal posteroventral lobes (smaller outer and larger inner) on somite, each tipped with 1 seta.
<taxonomicNameid="4C6D4D5EED733817FEF9FDCFFE36FDDA"authority="Kim & Boxshall, 2020"authorityName="Kim & Boxshall"authorityYear="2020"box="[316,499,513,539]"class="Copepoda"family="Notodelphyidae"genus="Ctenixys"kingdom="Animalia"order="Cyclopoida"pageId="546"pageNumber="547"phylum="Arthropoda"rank="species"species="pusilla"status="gen. et sp. nov.">
<taxonomicNameLabelid="A22A57B4ED733817FE3BFDCFFD72FDDA"box="[510,695,513,539]"pageId="546"pageNumber="547"rank="species">gen. et sp. nov.</taxonomicNameLabel>
</emphasis>
differs from its congenersin theabsence of an innerdistalelement on the basis of leg 1, in the absence of an endopod on leg 3 (cf. present in both other species), in the possession of fewer setae on the maxilliped (4 or 5, compared with
<taxonomicNameid="4C6D4D5EED733817FE6CFD65FDD7FD04"authorityName="Stock & Humes"authorityYear="1970"box="[425,530,683,710]"class="Copepoda"family="Notodelphyidae"genus="Demoixys"higherTaxonomySource="GBIF"kingdom="Animalia"order="Cyclopoida"pageId="546"pageNumber="547"phylum="Arthropoda"rank="species"species="affinis">