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<mods:title id="2FFEF7D82BF9D245D9BEEB05AE4D70B8">Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus</mods:title>
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<treatment id="03B487DAFF27D98BC9C81F96FD6FFE70" ID-DOI="http://doi.org/10.5281/zenodo.4580602" ID-GBIF-Taxon="181871915" ID-Zenodo-Dep="4580602" LSID="urn:lsid:plazi:treatment:03B487DAFF27D98BC9C81F96FD6FFE70" httpUri="http://treatment.plazi.org/id/03B487DAFF27D98BC9C81F96FD6FFE70" lastPageId="147" lastPageNumber="147" pageId="146" pageNumber="147">
<subSubSection id="C3076547FF27D98AC9C81F96FE9CFB3C" pageId="146" pageNumber="147" type="nomenclature">
<paragraph id="8BA236CCFF27D98AC9C81F96FE00FB59" blockId="146.[151,500,1158,1221]" box="[151,500,1158,1185]" pageId="146" pageNumber="147">
<heading id="D0EA81A0FF27D98AC9C81F96FE00FB59" bold="true" box="[151,500,1158,1185]" fontSize="11" level="2" pageId="146" pageNumber="147" reason="4">
<taxonomicName id="4C1D4D4FFF27D98AC9C81F96FE00FB59" ID-CoL="3QMZG" authority="Conlan, 1990" authorityName="Conlan" authorityYear="1990" box="[151,500,1158,1185]" class="Malacostraca" family="Ischyroceridae" genus="Jassa" kingdom="Animalia" order="Amphipoda" pageId="146" pageNumber="147" phylum="Arthropoda" rank="species" species="fenwicki">
<emphasis id="B969EADEFF27D98AC9C81F96FE00FB59" bold="true" box="[151,500,1158,1185]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9C81F96FEBCFB58" bold="true" box="[151,328,1158,1185]" italics="true" pageId="146" pageNumber="147">Jassafenwicki</emphasis>
<bibRefCitation id="EF8C4B3DFF27D98AC8101F97FE00FB59" author="Conlan, K. E." box="[335,500,1158,1184]" pageId="146" pageNumber="147" pagination="2031 - 2075" refId="ref90850" refString="Conlan, K. E. (1990) Revision of the crustacean amphipod genus Jassa Leach (Corophioidea: Ischyroceridae). Canadian Journal of Zoology, 68, 2031 - 2075. https: // doi. org / 10.1139 / z 90 - 288" type="journal article" year="1990">Conlan, 1990</bibRefCitation>
</emphasis>
</taxonomicName>
</heading>
</paragraph>
<paragraph id="8BA236CCFF27D98AC9C81FBAFE9CFB3C" blockId="146.[151,500,1158,1221]" box="[151,360,1194,1221]" pageId="146" pageNumber="147">
(
<tableCitation id="C69F0377FF27D98AC9C01FBAFEF7FB3C" box="[159,259,1195,1221]" captionStart="TABLE 13" captionStartId="136.[151,239,225,249]" captionTargetPageId="136" captionText="TABLE 13. Key character states of locally distributed Southern Hemisphere species. Trans-hemispheric species (Table 10) may occur there as well. X indicates the presence of the first character state described while — indicates the alternative character state given in italics. S and L indicate length.? indicates that the state is unknown. Character states apply to both sexes and juveniles unless indicated otherwise." httpUri="http://table.plazi.org/id/DF626644FF3DD990C9C81BF0FD37FE9C" pageId="146" pageNumber="147" tableUuid="DF626644FF3DD990C9C81BF0FD37FE9C">Table 13</tableCitation>
,
<figureCitation id="13262A49FF27D98AC8501FBAFE94FB3C" box="[271,352,1194,1221]" captionStart="FIGURE 95" captionStartId="147.[151,250,1297,1321]" captionTargetBox="[160,1429,420,1266]" captionTargetId="figure-143@147.[151,1436,417,1274]" captionTargetPageId="147" captionText="FIGURE 95. Jassa fenwicki Conlan, 1990. Holotype, adult male, major form, 7.4 mm, AM P34951. Punui Bay, The Snares Islands, New Zealand (48°01 S, 166°32 E), 21 January 1977, G. D. Fenwick, coll. (AM).Allotype, subadult female, Cumberland Bay, South Georgia (54°14 S, 36°28 W), 9 May 1902, among algae, 12 m depth, type no. 3946 from lot no. 3015 (NRM). All views lateral. Setae omitted from the female gnathopod 2 profile. Scale 0.1 mm. Illustration after Conlan (1990)." figureDoi="http://doi.org/10.5281/zenodo.4580862" httpUri="https://zenodo.org/record/4580862/files/figure.png" pageId="146" pageNumber="147">Fig. 95</figureCitation>
)
</paragraph>
</subSubSection>
<subSubSection id="C3076547FF27D98AC9C81FE3FE22F86C" pageId="146" pageNumber="147" type="diagnosis">
<paragraph id="8BA236CCFF27D98AC9C81FE3FEE6FAF5" blockId="146.[151,1437,1266,2015]" box="[151,274,1266,1292]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9C81FE3FEE6FAF5" bold="true" box="[151,274,1266,1292]" pageId="146" pageNumber="147">Diagnosis.</emphasis>
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981E06FC42FAC8" blockId="146.[151,1437,1266,2015]" box="[199,950,1303,1329]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981E06FE72FAC8" box="[199,390,1303,1329]" italics="true" pageId="146" pageNumber="147">Mandibular palp</emphasis>
: article 2, dorsal margin without a fringe of setae.
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981E2AFC19FAAC" blockId="146.[151,1437,1266,2015]" box="[199,1005,1339,1365]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981E2AFEC7FAAC" box="[199,307,1339,1365]" italics="true" pageId="146" pageNumber="147">Maxilla 1</emphasis>
: without a seta or setal cluster at the base of the palp article 1.
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981E4EFCDAFA64" blockId="146.[151,1437,1266,2015]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981E4EFEA9FA80" box="[199,349,1375,1401]" italics="true" pageId="146" pageNumber="147">Gnathopod 1</emphasis>
: basis, anterolateral margin with a fringe of short, spine-like setae; carpus without a single or cluster of setae at the anterodistal junction of the propodus.
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981EB6FBA7FA1F" blockId="146.[151,1437,1266,2015]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981EB6FEAFFA38" box="[199,347,1447,1473]" italics="true" pageId="146" pageNumber="147">Gnathopod 2</emphasis>
: basis with a row of short, spine-like setae along the anterolateral margin; carpus and propodus, setae on the anterior margin short and simple (setal lengths &lt;20% of the basis width).
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981EFEFAD1F9F0" blockId="146.[151,1437,1266,2015]" box="[199,1317,1519,1545]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981EFEFE9BF9F0" box="[199,367,1519,1545]" italics="true" pageId="146" pageNumber="147">Pereopods 57</emphasis>
: propodus expanded anteroproximally, spines strong and along nearly its full length.
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981D02FB59F9D4" blockId="146.[151,1437,1266,2015]" box="[199,1197,1555,1581]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981D02FEC6F9D4" box="[199,306,1555,1581]" italics="true" pageId="146" pageNumber="147">Uropod 1</emphasis>
: ventral peduncular spinous process underlying about 1/2 of the longest ramus.
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981D26FB64F9AB" blockId="146.[151,1437,1266,2015]" box="[199,1168,1591,1618]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981D26FEC6F9A8" box="[199,306,1591,1617]" italics="true" pageId="146" pageNumber="147">Uropod 3</emphasis>
: inner ramus without spines mid-dorsally (with only the single apical spine).
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981D4AFB8CF98C" blockId="146.[151,1437,1266,2015]" box="[199,1144,1627,1653]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981D4AFEFBF98C" box="[199,271,1627,1653]" italics="true" pageId="146" pageNumber="147">Telson</emphasis>
: tip without apical setae (only the usual short setae at each dorsolateral cusp).
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981D6EFE72F960" blockId="146.[151,1437,1266,2015]" box="[199,390,1663,1689]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981D6EFE72F960" bold="true" box="[199,390,1663,1689]" pageId="146" pageNumber="147">Thumbed male:</emphasis>
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981DB2FC0EF944" blockId="146.[151,1437,1266,2015]" box="[199,1018,1698,1725]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981DB2FECEF944" box="[199,314,1699,1725]" italics="true" pageId="146" pageNumber="147">Antenna 2</emphasis>
: with plumose setae on the flagellum and peduncular article 5.
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981DD6FC4BF8FC" blockId="146.[151,1437,1266,2015]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981DD6FEAEF918" box="[199,346,1735,1761]" italics="true" pageId="146" pageNumber="147">Gnathopod 2</emphasis>
: propodus, palmar defining spines absent, the thumb distally squared and originating proximally. The dactyl is strongly expanded close to the junction with the propodus.
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981C1FFE60F8D1" blockId="146.[151,1437,1266,2015]" box="[199,404,1806,1832]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981C1FFE60F8D1" bold="true" box="[199,404,1806,1832]" pageId="146" pageNumber="147">Subadult female:</emphasis>
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981C22FB74F8B7" blockId="146.[151,1437,1266,2015]" box="[199,1152,1842,1870]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981C22FECEF8B4" box="[199,314,1843,1869]" italics="true" pageId="146" pageNumber="147">Antenna 2</emphasis>
: not plumose on the flagellum and peduncular article 5 (but see Remarks).
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981C46FD8FF888" blockId="146.[151,1437,1266,2015]" box="[199,635,1879,1905]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981C46FEAEF888" box="[199,346,1879,1905]" italics="true" pageId="146" pageNumber="147">Gnathopod 2</emphasis>
: propodus, palmsinuous.
</paragraph>
<paragraph id="8BA236CCFF27D98AC9981C6BFE22F86C" blockId="146.[151,1437,1266,2015]" box="[199,470,1914,1941]" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981C6BFE9DF86D" bold="true" box="[199,361,1914,1940]" pageId="146" pageNumber="147">Adult female:</emphasis>
unknown
</paragraph>
</subSubSection>
<subSubSection id="C3076547FF27D98BC9981C8EFD6FFE70" lastPageId="147" lastPageNumber="148" pageId="146" pageNumber="147" type="discussion">
<paragraph id="8BA236CCFF27D98BC9981C8EFD6FFE70" blockId="146.[151,1437,1266,2015]" lastBlockId="147.[151,1437,151,393]" lastPageId="147" lastPageNumber="148" pageId="146" pageNumber="147">
<emphasis id="B969EADEFF27D98AC9981C8EFECDF840" bold="true" box="[199,313,1951,1977]" pageId="146" pageNumber="147">Remarks.</emphasis>
Only one thumbed male, one subadult female and two juveniles are known from two collections in disparate locations (Cumberland Bay,
<collectingCountry id="F30A765CFF27D98ACB1D1CD2FD17F824" box="[578,739,1987,2013]" name="South Georgia and the South Sandwich Islands" pageId="146" pageNumber="147">South Georgia</collectingCountry>
(
<geoCoordinate id="EE29500BFF27D98ACBAB1CD5FCA4F826" box="[756,848,1988,2015]" degrees="54" direction="south" minutes="14" orientation="latitude" pageId="146" pageNumber="147" precision="925" value="-54.233334">54°14S</geoCoordinate>
,
<geoCoordinate id="EE29500BFF27D98ACA021CD5FC31F826" box="[861,965,1988,2015]" degrees="36" direction="west" minutes="28" orientation="longitude" pageId="146" pageNumber="147" precision="925" value="-36.466667">36°28W</geoCoordinate>
), and The Snares,
<collectingCountry id="F30A765CFF27D98ACDCA1CD2FADFF824" box="[1173,1323,1987,2013]" name="New Zealand" pageId="146" pageNumber="147">New Zealand</collectingCountry>
(
<geoCoordinate id="EE29500BFF27D98ACC631CD5FA6CF826" box="[1340,1432,1988,2015]" degrees="48" direction="south" minutes="01" orientation="latitude" pageId="146" pageNumber="147" precision="925" value="-48.016666">48°01S</geoCoordinate>
,
<geoCoordinate id="EE29500BFF26D98BC9C81B89FEF7FF4A" box="[151,259,152,179]" degrees="166" direction="east" minutes="32" orientation="longitude" pageId="147" pageNumber="148" precision="925" value="166.53334">166°32E</geoCoordinate>
)). In both collections
<taxonomicName id="4C1D4D4FFF26D98BC8AA1B86FD9FFF48" authorityName="Conlan" authorityYear="1990" box="[501,619,151,177]" class="Malacostraca" family="Ischyroceridae" genus="Jassa" kingdom="Animalia" order="Amphipoda" pageId="147" pageNumber="148" phylum="Arthropoda" rank="species" species="fenwicki">
<emphasis id="B969EADEFF26D98BC8AA1B86FD9FFF48" box="[501,619,151,177]" italics="true" pageId="147" pageNumber="148">J. fenwicki</emphasis>
</taxonomicName>
was mixed with
<taxonomicName id="4C1D4D4FFF26D98BCA761B86FC53FF48" authorityName="Conlan" authorityYear="1990" box="[809,935,151,177]" class="Malacostraca" family="Ischyroceridae" genus="Jassa" kingdom="Animalia" order="Amphipoda" pageId="147" pageNumber="148" phylum="Arthropoda" rank="species" species="alonsoae">
<emphasis id="B969EADEFF26D98BCA761B86FC53FF48" box="[809,935,151,177]" italics="true" pageId="147" pageNumber="148">J. alonsoae</emphasis>
</taxonomicName>
. The appearance of the minor form male and the adult female are unknown. However, the combination of the spine-like fringes on gnathopods 1 and 2, lack of a seta on the gnathopod 1 carpus-propodus anterior junction and the proximally expanded and strongly spinous propodus of pereopods 57 are distinctive. Although the subadult female lacked plumose setae on the antenna 2 peduncular article 5, larger individuals may develop them. All other species of
<taxonomicName id="4C1D4D4FFF26D98BCA301A36FC58FEB9" authorityName="Leach" authorityYear="1814" box="[879,940,295,320]" class="Malacostraca" family="Ischyroceridae" genus="Jassa" kingdom="Animalia" order="Amphipoda" pageId="147" pageNumber="148" phylum="Arthropoda" rank="genus">
<emphasis id="B969EADEFF26D98BCA301A36FC58FEB9" box="[879,940,295,320]" italics="true" pageId="147" pageNumber="148">Jassa</emphasis>
</taxonomicName>
that develop plumose setae in the larger male also develop them in the larger female. It can be reasonably assumed that since the subadult female has a sinuous palm of gnathopod 2, an adult female would as well.
</paragraph>
</subSubSection>
</treatment>
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