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<mods:title id="70FFDB414C4690814808EA041BA96A35">A redescription of Metopa species (Amphipoda, Stenothoidae) based on the type material. 1. Zoological Museum, Copenhagen (ZMUC)</mods:title>
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<emphasis id="C8F2E6788271652A62F1FD18FE98B489" bold="true" box="[151,348,714,740]" italics="true" pageId="2" pageNumber="3">Metopa clypeata</emphasis>
(
<bibRefCitation id="9E17479B8271652A630DFD18FDD4B489" author="Kroyer" box="[363,528,714,740]" pageId="2" pageNumber="36" refString="Kroyer, H. (1842) Nye nordiske Slaegter og Arter af Amfipodernes Orden, henhorende til Familien Gammarina. Naturhistorisk Tidsskrift, 4, 141 - 166." type="journal article" year="1842">Krøyer, 1842</bibRefCitation>
)
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<figureCitation id="62BD26EF8271652A62F1FD3FFF3EB56A" box="[151,250,749,775]" captionStart-0="FIGURE 1" captionStart-1="FIGURE 2" captionStart-2="FIGURE 3" captionStart-3="FIGURE 4" captionStart-4="FIGURE 5" captionStart-5="FIGURE 6" captionStart-6="FIGURE 7" captionStart-7="FIGURE 8" captionStart-8="FIGURE 9" captionStartId-0="3.[151,255,1899,1923]" captionStartId-1="4.[151,255,1813,1837]" captionStartId-2="5.[151,256,1964,1988]" captionStartId-3="6.[151,255,1823,1847]" captionStartId-4="7.[151,255,1974,1998]" captionStartId-5="8.[151,256,1976,2000]" captionStartId-6="9.[151,258,1965,1989]" captionStartId-7="10.[151,256,1936,1960]" captionStartId-8="11.[151,259,1942,1966]" captionTargetBox-0="[185,1401,197,1874]" captionTargetBox-1="[219,1367,194,1789]" captionTargetBox-2="[158,1428,194,1940]" captionTargetBox-3="[191,1395,194,1798]" captionTargetBox-4="[168,1418,194,1950]" captionTargetBox-5="[219,1354,194,1945]" captionTargetBox-6="[205,1385,194,1938]" captionTargetBox-7="[253,1312,194,1905]" captionTargetBox-8="[208,1382,194,1911]" captionTargetId-0="figure@3.[185,1401,197,1874]" captionTargetId-1="figure@4.[219,1367,194,1789]" captionTargetId-2="figure@5.[158,1428,194,1941]" captionTargetId-3="figure@6.[191,1395,194,1799]" captionTargetId-4="figure@7.[168,1419,194,1950]" captionTargetId-5="figure@8.[219,1354,194,1946]" captionTargetId-6="figure@9.[205,1386,194,1939]" captionTargetId-7="figure@10.[253,1313,194,1906]" captionTargetId-8="figure@11.[208,1383,194,1911]" captionTargetPageId-0="3" captionTargetPageId-1="4" captionTargetPageId-2="5" captionTargetPageId-3="6" captionTargetPageId-4="7" captionTargetPageId-5="8" captionTargetPageId-6="9" captionTargetPageId-7="10" captionTargetPageId-8="11" captionText-0="FIGURE 1. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: head, antenna 1, antenna 2, maxilliped, maxilla 2. All scale bars are 0.1 mm." captionText-1="FIGURE 2. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: maxilla 1, labrum, left mandible. All scale bars are 0.1 mm." captionText-2="FIGURE 3. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: gnathopod 1, gnathopod 2. All scale bars are 0.1 mm." captionText-3="FIGURE 4. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 3, pereopod 4, pereopod 5. All scale bars are 0.1 mm." captionText-4="FIGURE 5. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm." captionText-5="FIGURE 6. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: left mandible, right mandible, labrum, labium, maxilla 1, maxilla 2, maxilliped. All scale bars are 0.1 mm." captionText-6="FIGURE 7. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: gnathopod 1, gnathopod 2, pereopod 3. All scale bars are 0.1 mm." captionText-7="FIGURE 8. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: pereopod 4, telson, uropod 1, uropod 2, uropod 3. All scale bars are 0.1 mm." captionText-8="FIGURE 9. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: pereopod 5, pereopod 6, pereopod 7, urosome. All scale bars are 0.1 mm." httpUri-0="https://zenodo.org/record/187536/files/figure.png" httpUri-1="https://zenodo.org/record/187537/files/figure.png" httpUri-2="https://zenodo.org/record/187538/files/figure.png" httpUri-3="https://zenodo.org/record/187539/files/figure.png" httpUri-4="https://zenodo.org/record/187540/files/figure.png" httpUri-5="https://zenodo.org/record/187541/files/figure.png" httpUri-6="https://zenodo.org/record/187542/files/figure.png" httpUri-7="https://zenodo.org/record/187543/files/figure.png" httpUri-8="https://zenodo.org/record/187544/files/figure.png" pageId="2" pageNumber="3">Fig. 1–9</figureCitation>
, 
<figureCitation id="62BD26EF8271652A6361FD3FFE90B56A" box="[263,340,749,775]" captionStart-0="FIGURE 19" captionStart-1="FIGURE 20" captionStart-2="FIGURE 21" captionStartId-0="27.[151,259,1761,1785]" captionStartId-1="28.[151,256,1761,1785]" captionStartId-2="29.[151,257,1246,1270]" captionTargetBox-0="[151,1436,194,1735]" captionTargetBox-1="[151,1436,194,1736]" captionTargetBox-2="[151,1435,194,1221]" captionTargetId-0="figure@27.[151,1436,194,1737]" captionTargetId-1="figure@28.[151,1436,194,1737]" captionTargetId-2="figure@29.[151,1436,194,1222]" captionTargetPageId-0="27" captionTargetPageId-1="28" captionTargetPageId-2="29" captionText-0="FIGURE 19. Comparisons of mandible morphology of Metopa clypeata (left mandible) (A, B), M. glacialis (left mandible) (C, D), and M. groenlandica (left mandible) (E, F)." captionText-1="FIGURE 20. Comparisons of gnathopod 1 morphology of Metopa clypeata (A (outside), B (inside )), M. glacialis (C (outside), D (inside )), and M. groenlandica (E (inside ))." captionText-2="FIGURE 21. Seta-morphology. A: Metopa clypeata gnathopod 1, B: M. clypeata maxilla 1 outer plate apex, C: M. glacialis gnathopod 1, D: M. groenlandica gnathopod 1." httpUri-0="https://zenodo.org/record/187554/files/figure.png" httpUri-1="https://zenodo.org/record/187555/files/figure.png" httpUri-2="https://zenodo.org/record/187556/files/figure.png" pageId="2" pageNumber="3">19–21</figureCitation>
.
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<taxonomicName id="3D8641E98271652A62F1FCE8FDE9B53C" authority="Kroyer, 1842:157" authorityName="Kroyer" authorityPageNumber="157" authorityYear="1842" box="[151,557,826,849]" class="Malacostraca" family="Leucothoidae" genus="Leucothoe" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="3" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E6788271652A62F1FCE8FEA3B53C" box="[151,359,826,849]" italics="true" pageId="2" pageNumber="3">Leucothoe clypeata</emphasis>
<treatmentCitation id="7B271C7B8271652A630BFCE8FDE9B53C" author="Kroyer" box="[365,557,826,849]" page="157" pageId="2" pageNumber="3" year="1842">
<bibRefCitation id="9E17479B8271652A630BFCE8FE3BB53C" author="Kroyer" box="[365,511,826,849]" pageId="2" pageNumber="36" refString="Kroyer, H. (1842) Nye nordiske Slaegter og Arter af Amfipodernes Orden, henhorende til Familien Gammarina. Naturhistorisk Tidsskrift, 4, 141 - 166." type="journal article" year="1842">Krøyer, 1842</bibRefCitation>
:157
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; 
<treatmentCitation id="7B271C7B8271652A605EFCE8FD35B53C" author="Kroyer" box="[568,753,826,849]" page="545" pageId="2" pageNumber="3" year="1845">
<bibRefCitation id="9E17479B8271652A605EFCE8FD06B53C" author="Kroyer" box="[568,706,826,849]" pageId="2" pageNumber="36" refString="Kroyer, H. (1845) Karcinologiske Bidrag (fortsaettelse). Naturhistorisk Tidsskrift, NS vol. 1 pp 453 - 638." type="book chapter" year="1845">Krøyer 1845</bibRefCitation>
:545
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, pl. 6 fig. 2a–f
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<taxonomicName id="3D8641E98271652A62F1FC88FDE7B51C" authority="Liljeborg, 1850" authorityName="Liljeborg" authorityYear="1850" box="[151,547,858,881]" class="Malacostraca" family="Leucothoidae" genus="Leucothoe" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="3" phylum="Arthropoda" rank="species" species="norvegica">
<emphasis id="C8F2E6788271652A62F1FC88FEB3B51C" box="[151,375,858,881]" italics="true" pageId="2" pageNumber="3">Leucothoe norvegica</emphasis>
<bibRefCitation id="9E17479B8271652A6318FC88FDE7B51C" author="Liljeborg" box="[382,547,858,881]" pageId="2" pageNumber="36" refString="Liljeborg, V. (1850) Bidrag till den hognordiska hafsfaunan. Ofversigt af Kongliga Vetenskaps-Akademiens Forhandlingar, 7, 82 - 88." type="journal article" year="1850">Liljeborg, 1850</bibRefCitation>
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<treatmentCitationGroup id="DA961D448271652A62F1FCA8FD7BB5FC" box="[151,703,890,913]" pageId="2" pageNumber="3">
<taxonomicName id="3D8641E98271652A62F1FCA8FDCFB5FC" ID-CoL="6RPTK" authority="Bate, 1862:58" authorityName="Bate" authorityPageNumber="58" authorityYear="1862" box="[151,523,890,913]" class="Malacostraca" family="Stenothoidae" genus="Montagua" higherTaxonomySource="GBIF" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="3" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E6788271652A62F1FCA8FEA2B5FC" box="[151,358,890,913]" italics="true" pageId="2" pageNumber="3">Montagua clypeata</emphasis>
<treatmentCitation id="7B271C7B8271652A6314FCA8FDCFB5FC" author="Bate" box="[370,523,890,913]" page="58" pageId="2" pageNumber="3" year="1862">
<bibRefCitation id="9E17479B8271652A6314FCA8FE2FB5FC" author="Bate" box="[370,491,890,913]" pageId="2" pageNumber="35" refString="Bate, C. Sp. (1862) Catalogue of the Specimens of Amphipodous Crustacea in the Collection of the British Museum. Trustees of British Museum, London, UK." type="book" year="1862">Bate, 1862</bibRefCitation>
:58
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; 
<treatmentCitation id="7B271C7B8271652A6070FCA8FD7BB5FC" author="Goes" box="[534,703,890,913]" page="522" pageId="2" pageNumber="3" year="1866">
<bibRefCitation id="9E17479B8271652A6070FCA8FD55B5FC" author="Goes" box="[534,657,890,913]" pageId="2" pageNumber="35" refString="Goes, A. (1866) Crustacea Amphipoda maris Spetsbergiam alluentis, cum speciebus aliis arcticis enumerat. Ofversigt af Kungliga Vetenskaps-Akademiens Forhandlingar, 1865 (8), 517 - 536." type="journal article" year="1866">Goës, 1866</bibRefCitation>
:522
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<emphasis id="C8F2E6788271652A62F1FC48FE8BB5DC" box="[151,335,922,945]" italics="true" pageId="2" pageNumber="3">Metopa clypeata</emphasis>
<treatmentCitation id="7B271C7B8271652A633BFC48FDCBB5DC" author="Boeck" box="[349,527,922,945]" page="60" pageId="2" pageNumber="3" year="1870">
<bibRefCitation id="9E17479B8271652A633BFC48FE2AB5DC" author="Boeck" box="[349,494,922,945]" pageId="2" pageNumber="35" refString="Boeck, A. (1870) Crustacea Amphipoda borealia et arctica. Videnskapelig Selskabs Forhandlinger 1870, 83 - 280." type="journal article" year="1870">Boeck, 1870</bibRefCitation>
:60
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, 
<treatmentCitation id="7B271C7B8271652A6046FC48FD1BB5DC" author="Boeck" box="[544,735,922,945]" page="451" pageId="2" pageNumber="3" year="1872">
<bibRefCitation id="9E17479B8271652A6046FC48FD76B5DC" author="Boeck" box="[544,690,922,945]" pageId="2" pageNumber="35" refString="Boeck, A. (1872) De Skandinaviske og Arktiske Amphipoder. A. W. Brogger, Christiania, 160 pp." type="book" year="1872">Boeck, 1872</bibRefCitation>
:451
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, pl. XVIII-4, XIX-3, 
<treatmentCitation id="7B271C7B8271652A61B9FC48FB58B5DC" author="Hansen" box="[991,1180,922,945]" page="90" pageId="2" pageNumber="3" year="1888">
<bibRefCitation id="9E17479B8271652A61B9FC48FBB8B5DC" author="Hansen" box="[991,1148,922,945]" pageId="2" pageNumber="36" refString="Hansen, H. J. (1888) Malacostraca marina Groenlandiae occidentalis. Oversigt over det vestlige Gronlands Fauna af malakostrake Havkrebsdyr. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening, 1887, 5 - 226." type="journal article" year="1888">Hansen, 1888</bibRefCitation>
:90
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, fig 
<date id="8E381CAA8271652A66BFFC48FAC8B5DC" box="[1241,1292,922,945]" pageId="2" pageNumber="3">III-3</date>
, 
<treatmentCitation id="7B271C7B8271652A6778FC48FEE4B5BC" author="Shoemaker" page="15" pageId="2" pageNumber="3" year="1955">
<bibRefCitation id="9E17479B8271652A6778FC48FEC6B5BC" author="Shoemaker" pageId="2" pageNumber="36" refString="Shoemaker, C. R. (1955) Amphipoda collected at the Arctic Laboratory, Office of Naval Research, Point Barrow, Alaska, by G. E. MacGinitie. Smithsonian Miscellaneous Collections, 128 (1), 1 - 78." type="journal article" year="1955">Shoemaker, 1955</bibRefCitation>
:15
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, fig. 5 a–f, 
<treatmentCitation id="7B271C7B8271652A63FCFC68FDE3B5BC" author="Just" box="[410,551,954,977]" page="46" pageId="2" pageNumber="3" year="1980">
<bibRefCitation id="9E17479B8271652A63FCFC68FDCDB5BC" author="Just" box="[410,521,954,977]" pageId="2" pageNumber="36" refString="Just, J. (1980) Amphipoda (Crustacea) of the Thule area, northwest Greenland: faunistics and taxonomy. Meddelelser om Gronland Bioscience, 2, 1 - 61." type="journal article" year="1980">Just, 1980</bibRefCitation>
:46
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<treatmentCitationGroup id="DA961D448271652A62F1FC08FD39B59C" box="[151,765,986,1009]" pageId="2" pageNumber="3">
? 
<taxonomicName id="3D8641E98271652A62CFFC08FD80B59C" ID-CoL="42GJT" authority="Oldevig, 1959:45" authorityName="Oldevig" authorityPageNumber="45" authorityYear="1959" box="[169,580,986,1009]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="3" phylum="Arthropoda" rank="species" species="beringiensis">
<emphasis id="C8F2E6788271652A62CFFC08FE40B59C" box="[169,388,986,1009]" italics="true" pageId="2" pageNumber="3">Metopa beringiensis</emphasis>
<treatmentCitation id="7B271C7B8271652A63ECFC08FD80B59C" author="Oldevig" box="[394,580,986,1009]" page="45" pageId="2" pageNumber="3" year="1959">
<bibRefCitation id="9E17479B8271652A63ECFC08FDE0B59C" author="Oldevig" box="[394,548,986,1009]" pageId="2" pageNumber="36" refString="Oldevig, H. (1959) Arctic, subarctic and Scandinavian amphipods in the collections of the Swedish Natural History Museum in Stockholm. Meddelanden fran Goteborgs Musei Zoologiska Avdelning, 127, 1 - 132." type="journal article" year="1959">Oldevig, 1959</bibRefCitation>
:45
</treatmentCitation>
</taxonomicName>
–46, pl.1 fig. 7–8
</treatmentCitationGroup>
</paragraph>
<paragraph id="FA393A6A8271652A62F1FC28FDA6B27C" blockId="2.[151,1436,826,1041]" box="[151,610,1018,1041]" pageId="2" pageNumber="3">
<treatmentCitationGroup id="DA961D448271652A62F1FC28FDA6B27C" box="[151,610,1018,1041]" pageId="2" pageNumber="3">
non 
<taxonomicName id="3D8641E98271652A62A3FC28FDA6B27C" ID-CoL="42GK2" authority="Gurjanova, 1951:417" authorityName="Gurjanova" authorityPageNumber="417" authorityYear="1951" box="[197,610,1018,1041]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="2" pageNumber="3" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E6788271652A62A3FC28FEB3B27C" box="[197,375,1018,1041]" italics="true" pageId="2" pageNumber="3">Metopa clypeata</emphasis>
<treatmentCitation id="7B271C7B8271652A6318FC28FDA6B27C" author="Gurjanova" box="[382,610,1018,1041]" page="417" pageId="2" pageNumber="3" year="1951">
<bibRefCitation id="9E17479B8271652A6318FC28FDF6B27C" author="Gurjanova" box="[382,562,1018,1041]" pageId="2" pageNumber="36" refString="Gurjanova, E. F. (1951) Gammaridea of the seas of the USSR and adjacent waters (Amphipoda - Gammaridea). Opredeliteli po Faune SSSR Izdavaemye Zoologicheskim Institutom Akademii Nauk SSSR, 41, 1031. (in Russian)" type="journal article" year="1951">Gurjanova, 1951</bibRefCitation>
:417
</treatmentCitation>
</taxonomicName>
</treatmentCitationGroup>
</paragraph>
</subSubSection>
<subSubSection id="B29C69E18271652462F1FB92FAF5B23F" lastPageId="12" lastPageNumber="13" pageId="2" pageNumber="3" type="materials_examined">
<paragraph id="FA393A6A8271652A62F1FB92FD58B2C5" blockId="2.[151,1437,1088,1927]" pageId="2" pageNumber="3">
<emphasis id="C8F2E6788271652A62F1FB92FE55B237" bold="true" box="[151,401,1088,1114]" pageId="2" pageNumber="3">Material examined.</emphasis>
Morphological examination: ZMUC-CRU 6050 (
<collectingCountry id="82917AFA8271652A618AFB93FBB4B236" box="[1004,1136,1089,1115]" name="Greenland" pageId="2" pageNumber="3">Greenland</collectingCountry>
), male, 6.4 mm; ZMUC- 
<collectionCode id="9C97A2AF8271652A62F1FBBAFF17B2EF" box="[151,211,1128,1154]" pageId="2" pageNumber="3">CRU</collectionCode>
6050, female, 8.9 mm 
<typeStatus id="253D84C88271652A6380FBBAFDEBB2EF" box="[486,559,1128,1154]" pageId="2" pageNumber="3">
<collectionCode id="9C97A2AF8271652A6380FBBAFDEBB2EF" box="[486,559,1128,1154]" pageId="2" pageNumber="3">TYPE</collectionCode>
</typeStatus>
material; USNMNH 419533, male, 
<quantity id="3D7E978F8271652A61B8FBBAFBE7B2EF" box="[990,1059,1128,1154]" metricMagnitude="-3" metricUnit="m" metricValue="7.0" pageId="2" pageNumber="3" unit="mm" value="7.0">7 mm</quantity>
(Albatross station 3282, Bering Sea); Zool. Mus. AN No 22646 (114-1950);
</paragraph>
<paragraph id="FA393A6A8271652A62A3FB67FCEDB2A2" blockId="2.[151,1437,1088,1927]" box="[197,809,1205,1231]" pageId="2" pageNumber="3">
SEM-examination: ZMUC-CRU 6050, male, 
<quantity id="3D7E978F8271652A60B8FB67FCE2B2A2" box="[734,806,1205,1231]" metricMagnitude="-3" metricUnit="m" metricValue="6.0" pageId="2" pageNumber="3" unit="mm" value="6.0">6 mm</quantity>
.
</paragraph>
<paragraph id="FA393A6A8271652A62A3FB09FB60B1EA" blockId="2.[151,1437,1088,1927]" pageId="2" pageNumber="3">
<emphasis id="C8F2E6788271652A62A3FB09FCABB298" bold="true" box="[197,879,1243,1269]" pageId="2" pageNumber="3">
Morphological redescription of male 
<typeStatus id="253D84C88271652A60D3FB09FD2AB298" box="[693,750,1243,1269]" pageId="2" pageNumber="3">type</typeStatus>
material.
</emphasis>
Head (
<figureCitation id="62BD26EF8271652A61AAFB0EFBD2B29B" box="[972,1046,1244,1270]" captionStart="FIGURE 1" captionStartId="3.[151,255,1899,1923]" captionTargetBox="[185,1401,197,1874]" captionTargetId="figure@3.[185,1401,197,1874]" captionTargetPageId="3" captionText="FIGURE 1. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: head, antenna 1, antenna 2, maxilliped, maxilla 2. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187536/files/figure.png" pageId="2" pageNumber="3">Fig. 1</figureCitation>
): epistome small and rounded, cephalic lobe not prominent, with acute tip; eye 1/3 of head length, well defined. Antenna 1 (
<figureCitation id="62BD26EF8271652A66BEFAD0FAD8B371" box="[1240,1308,1282,1308]" captionStart="FIGURE 1" captionStartId="3.[151,255,1899,1923]" captionTargetBox="[185,1401,197,1874]" captionTargetId="figure@3.[185,1401,197,1874]" captionTargetPageId="3" captionText="FIGURE 1. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: head, antenna 1, antenna 2, maxilliped, maxilla 2. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187536/files/figure.png" pageId="2" pageNumber="3">Fig. 1</figureCitation>
): long and slender, half length of body; flagellum of approximately 20 articles, one small seta on each article; no accessory flagellum observed. Antenna 2 (
<figureCitation id="62BD26EF8271652A60ECFA82FD0BB307" box="[650,719,1360,1386]" captionStart="FIGURE 1" captionStartId="3.[151,255,1899,1923]" captionTargetBox="[185,1401,197,1874]" captionTargetId="figure@3.[185,1401,197,1874]" captionTargetPageId="3" captionText="FIGURE 1. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: head, antenna 1, antenna 2, maxilliped, maxilla 2. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187536/files/figure.png" pageId="2" pageNumber="3">Fig. 1</figureCitation>
): shorter than A1; peduncle longer than flagellum; flagellum of 10 articles, each with one thin seta. Labrum (
<figureCitation id="62BD26EF8271652A608CFAA4FCFCB3FD" box="[746,824,1398,1424]" captionStart="FIGURE 2" captionStartId="4.[151,255,1813,1837]" captionTargetBox="[219,1367,194,1789]" captionTargetId="figure@4.[219,1367,194,1789]" captionTargetPageId="4" captionText="FIGURE 2. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: maxilla 1, labrum, left mandible. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187537/files/figure.png" pageId="2" pageNumber="3">Fig. 2</figureCitation>
): rounded. Mandible (
<figureCitation id="62BD26EF8271652A662DFAA4FB5DB3FD" box="[1099,1177,1398,1424]" captionStart="FIGURE 2" captionStartId="4.[151,255,1813,1837]" captionTargetBox="[219,1367,194,1789]" captionTargetId="figure@4.[219,1367,194,1789]" captionTargetPageId="4" captionText="FIGURE 2. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: maxilla 1, labrum, left mandible. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187537/files/figure.png" pageId="2" pageNumber="3">Fig. 2</figureCitation>
): mandibular palp 2- articulate (see Discussion), circular in cross-section, 5 serrated setae with an inner smooth core (
<typeStatus id="253D84C88271652A6767FA4FFAF1B3DA" box="[1281,1333,1437,1463]" pageId="2" pageNumber="3">type</typeStatus>
A setae, see Discussion) on article 1, very small apical article (article 2) with 1–2 
<typeStatus id="253D84C88271652A6677FA16FB81B3B3" box="[1041,1093,1476,1502]" pageId="2" pageNumber="3">type</typeStatus>
A setae at apex; incisor and lacinia mobilis both serrate and well developed; raker setae with 3 plumose setae nearest incisor and 7–8 serrate raker setae further back; no molar. Maxilla 1 (
<figureCitation id="62BD26EF8271652A6179F9C3FCAEB046" box="[799,874,1553,1579]" captionStart="FIGURE 2" captionStartId="4.[151,255,1813,1837]" captionTargetBox="[219,1367,194,1789]" captionTargetId="figure@4.[219,1367,194,1789]" captionTargetPageId="4" captionText="FIGURE 2. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: maxilla 1, labrum, left mandible. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187537/files/figure.png" pageId="2" pageNumber="3">Fig. 2</figureCitation>
): inner plate with one simple distal seta; outer plate with 3 cuspidate and 3 serrated distal setae and 7 simple setae on inner margin; palp 1-articulate, 
<date id="8E381CAA8271652A6718F9EAFA5FB03F" box="[1406,1435,1592,1618]" pageId="2" pageNumber="3">2x</date>
length of outer plate, with 3 cuspidate distal setae, 4 simple setae on inner margin and several simple facial setae. Maxilla 2 (
<figureCitation id="62BD26EF8271652A6306F957FE61B0F2" box="[352,421,1669,1695]" captionStart="FIGURE 1" captionStartId="3.[151,255,1899,1923]" captionTargetBox="[185,1401,197,1874]" captionTargetId="figure@3.[185,1401,197,1874]" captionTargetPageId="3" captionText="FIGURE 1. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: head, antenna 1, antenna 2, maxilliped, maxilla 2. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187536/files/figure.png" pageId="2" pageNumber="3">Fig. 1</figureCitation>
): outer plate in normal position to and slightly longer than inner plate; both plates with several simple setae (outer with 8 and inner with 10). Maxilliped (
<figureCitation id="62BD26EF8271652A61C8F97EFC30B0AB" box="[942,1012,1708,1734]" captionStart="FIGURE 1" captionStartId="3.[151,255,1899,1923]" captionTargetBox="[185,1401,197,1874]" captionTargetId="figure@3.[185,1401,197,1874]" captionTargetPageId="3" captionText="FIGURE 1. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: head, antenna 1, antenna 2, maxilliped, maxilla 2. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187536/files/figure.png" pageId="2" pageNumber="3">Fig. 1</figureCitation>
): long and slim; inner plates fused, with a small notch at tip, a ridge along the middle, 3 simple setae at each side of the notch; outer plate reduced to a small widening of the distal edge of the ischium; palp 4-articulate with several simple setae at inner edge; articles 2, 3 and 4 subequal in length, and all longer than article 1; article 3 with an apical patch of densely set short simple setae and two slight cuspidate setae; article 4 with at row of short simple setae on inner edge. Pereon: smooth; pereonite 4 slightly longer and pereonite 1 slightly shorter than the rest.
</paragraph>
<caption id="AEF96AE28270652B62F1F8B9FDE4B1C8" httpUri="https://zenodo.org/record/187536/files/figure.png" pageId="3" pageNumber="4" targetBox="[185,1401,197,1874]" targetPageId="3">
<paragraph id="FA393A6A8270652B62F1F8B9FDE4B1C8" blockId="3.[151,1436,1899,1957]" pageId="3" pageNumber="4">
<emphasis id="C8F2E6788270652B62F1F8B9FEDDB1EE" bold="true" box="[151,281,1899,1923]" pageId="3" pageNumber="4">FIGURE 1.</emphasis>
<taxonomicName id="3D8641E98270652B6379F8B9FDA3B1EF" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[287,615,1899,1922]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="3" pageNumber="4" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E6788270652B6379F8B9FE15B1EF" box="[287,465,1899,1922]" italics="true" pageId="3" pageNumber="4">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, female syntype, 8.9 mm, Greenland: head, antenna 1, antenna 2, maxilliped, maxilla 2. All scale bars are 0.1 mm.
</paragraph>
</caption>
<caption id="AEF96AE28277652C62F1F8C7FE42B122" httpUri="https://zenodo.org/record/187537/files/figure.png" pageId="4" pageNumber="5" targetBox="[219,1367,194,1789]" targetPageId="4">
<paragraph id="FA393A6A8277652C62F1F8C7FE42B122" blockId="4.[151,1436,1813,1871]" pageId="4" pageNumber="5">
<emphasis id="C8F2E6788277652C62F1F8C7FEDEB140" bold="true" box="[151,282,1813,1837]" pageId="4" pageNumber="5">FIGURE 2.</emphasis>
<taxonomicName id="3D8641E98277652C6344F8C7FDABB141" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[290,623,1813,1836]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="4" pageNumber="5" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E6788277652C6344F8C7FE12B141" box="[290,470,1813,1836]" italics="true" pageId="4" pageNumber="5">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, female syntype, 8.9 mm, Greenland: maxilla 1, labrum, left mandible. All scale bars are 0.1 mm.
</paragraph>
</caption>
<caption id="AEF96AE28276652D62F1F87EFE8EB18B" httpUri="https://zenodo.org/record/187538/files/figure.png" pageId="5" pageNumber="6" targetBox="[158,1428,194,1940]" targetPageId="5">
<paragraph id="FA393A6A8276652D62F1F87EFE8EB18B" blockId="5.[151,1436,1964,2022]" pageId="5" pageNumber="6">
<emphasis id="C8F2E6788276652D62F1F87EFED8B1A9" bold="true" box="[151,284,1964,1988]" pageId="5" pageNumber="6">FIGURE 3.</emphasis>
<taxonomicName id="3D8641E98276652D6345F87FFDB5B1A9" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[291,625,1965,1988]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="5" pageNumber="6" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E6788276652D6345F87FFE1CB1A9" box="[291,472,1965,1988]" italics="true" pageId="5" pageNumber="6">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, female syntype, 8.9 mm, Greenland: gnathopod 1, gnathopod 2. All scale bars are 0.1 mm.
</paragraph>
</caption>
<caption id="AEF96AE28275652E62F1F8CDFE6BB134" httpUri="https://zenodo.org/record/187539/files/figure.png" pageId="6" pageNumber="7" targetBox="[191,1395,194,1798]" targetPageId="6">
<paragraph id="FA393A6A8275652E62F1F8CDFE6BB134" blockId="6.[151,1436,1823,1881]" pageId="6" pageNumber="7">
<emphasis id="C8F2E6788275652E62F1F8CDFEDEB15A" bold="true" box="[151,282,1823,1847]" pageId="6" pageNumber="7">FIGURE 4.</emphasis>
<taxonomicName id="3D8641E98275652E6344F8F2FDB4B15B" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[290,624,1823,1847]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="6" pageNumber="7" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E6788275652E6344F8F2FE13B15A" box="[290,471,1824,1847]" italics="true" pageId="6" pageNumber="7">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, female syntype, 8.9 mm, Greenland: pereopod 3, pereopod 4, pereopod 5. All scale bars are 0.1 mm.
</paragraph>
</caption>
<caption id="AEF96AE28274652F62F1F864FC6FB19D" httpUri="https://zenodo.org/record/187540/files/figure.png" pageId="7" pageNumber="8" targetBox="[168,1418,194,1950]" targetPageId="7">
<paragraph id="FA393A6A8274652F62F1F864FC6FB19D" blockId="7.[151,1436,1974,2032]" pageId="7" pageNumber="8">
<emphasis id="C8F2E6788274652F62F1F864FEDFB1A3" bold="true" box="[151,283,1974,1998]" pageId="7" pageNumber="8">FIGURE 5.</emphasis>
<taxonomicName id="3D8641E98274652F6344F865FDB4B1A0" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[290,624,1974,1998]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="7" pageNumber="8" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E6788274652F6344F865FE13B1A3" box="[290,471,1975,1998]" italics="true" pageId="7" pageNumber="8">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm.
</paragraph>
</caption>
<caption id="AEF96AE2827B652062F1F86AFC04B19F" httpUri="https://zenodo.org/record/187541/files/figure.png" pageId="8" pageNumber="9" targetBox="[219,1354,194,1945]" targetPageId="8">
<paragraph id="FA393A6A827B652062F1F86AFC04B19F" blockId="8.[151,1436,1976,2034]" pageId="8" pageNumber="9">
<emphasis id="C8F2E678827B652062F1F86AFED8B1BD" bold="true" box="[151,284,1976,2000]" pageId="8" pageNumber="9">FIGURE 6.</emphasis>
<taxonomicName id="3D8641E9827B65206345F86BFDB0B1A2" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[291,628,1976,2000]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="8" pageNumber="9" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827B65206345F86BFE1CB1BD" box="[291,472,1977,2000]" italics="true" pageId="8" pageNumber="9">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, from USNMNH, male, 7 mm, Bering Sea: left mandible, right mandible, labrum, labium, maxilla 1, maxilla 2, maxilliped. All scale bars are 0.1 mm.
</paragraph>
</caption>
<caption id="AEF96AE2827A652162F1F87FFDF7B18A" httpUri="https://zenodo.org/record/187542/files/figure.png" pageId="9" pageNumber="10" targetBox="[205,1385,194,1938]" targetPageId="9">
<paragraph id="FA393A6A827A652162F1F87FFDF7B18A" blockId="9.[151,1436,1965,2023]" pageId="9" pageNumber="10">
<emphasis id="C8F2E678827A652162F1F87FFEDBB1A8" bold="true" box="[151,287,1965,1989]" pageId="9" pageNumber="10">FIGURE 7.</emphasis>
<taxonomicName id="3D8641E9827A65216340F87CFD44B1A9" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[294,640,1965,1989]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="9" pageNumber="10" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827A65216340F87CFE25B1A8" box="[294,481,1966,1989]" italics="true" pageId="9" pageNumber="10">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, from USNMNH, male, 7 mm, Bering Sea: gnathopod 1, gnathopod 2, pereopod 3. All scale bars are 0.1 mm.
</paragraph>
</caption>
<caption id="AEF96AE28279652262F1F842FD4CB1A7" httpUri="https://zenodo.org/record/187543/files/figure.png" pageId="10" pageNumber="11" targetBox="[253,1312,194,1905]" targetPageId="10">
<paragraph id="FA393A6A8279652262F1F842FD4CB1A7" blockId="10.[151,1436,1936,1994]" pageId="10" pageNumber="11">
<emphasis id="C8F2E6788279652262F1F842FED8B1C5" bold="true" box="[151,284,1936,1960]" pageId="10" pageNumber="11">FIGURE 8.</emphasis>
<taxonomicName id="3D8641E9827965226342F843FDB2B1CA" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[292,630,1936,1960]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="10" pageNumber="11" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827965226342F843FE1EB1C5" box="[292,474,1937,1960]" italics="true" pageId="10" pageNumber="11">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, from USNMNH, male, 7 mm, Bering Sea: pereopod 4, telson, uropod 1, uropod 2, uropod 3. All scale bars are 0.1 mm.
</paragraph>
</caption>
<caption id="AEF96AE28278652362F1F844FD58B1BD" httpUri="https://zenodo.org/record/187544/files/figure.png" pageId="11" pageNumber="12" targetBox="[208,1382,194,1911]" targetPageId="11">
<paragraph id="FA393A6A8278652362F1F844FD58B1BD" blockId="11.[151,1436,1942,2000]" pageId="11" pageNumber="12">
<emphasis id="C8F2E6788278652362F1F844FEE5B1C3" bold="true" box="[151,289,1942,1966]" pageId="11" pageNumber="12">FIGURE 9.</emphasis>
<taxonomicName id="3D8641E982786523634FF844FD4FB1C0" authority="Kroyer, 1842" authorityName="Kroyer" authorityYear="1842" box="[297,651,1942,1965]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="11" pageNumber="12" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E67882786523634FF844FE2DB1C0" box="[297,489,1942,1965]" italics="true" pageId="11" pageNumber="12">Metopa clypeata</emphasis>
Krøyer, 1842
</taxonomicName>
, from USNMNH, male, 7 mm, Bering Sea: pereopod 5, pereopod 6, pereopod 7, urosome. All scale bars are 0.1 mm.
</paragraph>
</caption>
<paragraph id="FA393A6A827F652462A3FF4AFAAEB52E" blockId="12.[151,1437,152,2034]" pageId="12" pageNumber="13">
Gnathopod 1 (
<figureCitation id="62BD26EF827F65246317FF4AFE7FB6DF" box="[369,443,152,178]" captionStart="FIGURE 3" captionStartId="5.[151,256,1964,1988]" captionTargetBox="[158,1428,194,1940]" captionTargetId="figure@5.[158,1428,194,1941]" captionTargetPageId="5" captionText="FIGURE 3. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: gnathopod 1, gnathopod 2. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187538/files/figure.png" pageId="12" pageNumber="13">Fig. 3</figureCitation>
): simple; coxa small, semiquadrate with front distal corner rounded; basis slender, few setae at anterior margin; ischium short, few setae at posterodistal corner; merus semi-oval, with carpus inserted near basis, distal free lobe with a patch of short simple setae and a simple crown of 
<typeStatus id="253D84C8827F6524669BFF37FAF5B692" box="[1277,1329,229,255]" pageId="12" pageNumber="13">type</typeStatus>
A setae; carpus elongate, longer than propodus, marginally wider at proximal end, posterior margin covered with long 
<typeStatus id="253D84C8827F652462F1FEE0FF0DB721" box="[151,201,306,332]" pageId="12" pageNumber="13">type</typeStatus>
A setae, and inner ’face’ has a single diagonal row of 
<typeStatus id="253D84C8827F65246128FEE0FC44B721" box="[846,896,306,332]" pageId="12" pageNumber="13">type</typeStatus>
A setae on proximal half; propodus long (3/4 of carpus length) and very slim, no palm, several long thin simple (
<typeStatus id="253D84C8827F652461C1FE8BFC27B71E" box="[935,995,345,371]" pageId="12" pageNumber="13">Type</typeStatus>
II annulate, without setules, Watling) setae both on face and along posterior margin; dactylus pectinate, 1/6 of propodus length, a row of simple setae along posterior margin. Gnathopod 2 (
<figureCitation id="62BD26EF827F652460D1FE74FCC7B7AD" box="[695,771,422,448]" captionStart="FIGURE 3" captionStartId="5.[151,256,1964,1988]" captionTargetBox="[158,1428,194,1940]" captionTargetId="figure@5.[158,1428,194,1941]" captionTargetPageId="5" captionText="FIGURE 3. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: gnathopod 1, gnathopod 2. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187538/files/figure.png" pageId="12" pageNumber="13">Fig. 3</figureCitation>
): coxa covering coxa 1, directed forwards; merus and carpus with &quot;stridulating ridges&quot; along anterior margin (for a discussion about stridulating ridges in stenothoids, see Krapp-Schickel 1996), carpus with a row of 
<typeStatus id="253D84C8827F65246138FE26FC55B463" box="[862,913,500,526]" pageId="12" pageNumber="13">type</typeStatus>
A setae at posterior margin; propodus palma transverse, weakly convex, crenulate, delimited by a strong tooth, posterior margin straight, longer than palma; dactylus as long as palma, slightly curved, smooth. Pereopod 3 and 4 (
<figureCitation id="62BD26EF827F65246678FD93FBA2B436" box="[1054,1126,577,603]" captionStart="FIGURE 4" captionStartId="6.[151,255,1823,1847]" captionTargetBox="[191,1395,194,1798]" captionTargetId="figure@6.[191,1395,194,1799]" captionTargetPageId="6" captionText="FIGURE 4. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 3, pereopod 4, pereopod 5. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187539/files/figure.png" pageId="12" pageNumber="13">Fig. 4</figureCitation>
): simple and slender; coxa 3 slightly elongate; coxa 4 triangular, ventral margin rounded, dactylus of pereopod 4 with serrate posterior margin. Pereopod 5 (
<figureCitation id="62BD26EF827F652463E9FD5CFE1CB4C5" box="[399,472,654,680]" captionStart="FIGURE 4" captionStartId="6.[151,255,1823,1847]" captionTargetBox="[191,1395,194,1798]" captionTargetId="figure@6.[191,1395,194,1799]" captionTargetPageId="6" captionText="FIGURE 4. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 3, pereopod 4, pereopod 5. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187539/files/figure.png" pageId="12" pageNumber="13">Fig. 4</figureCitation>
): basis slender; meral lobe 1/3 of carpus, a row of paired simple setae on anterior margin of both merus and carpus; dactylus with a slight notch at tip. Pereopod 6 and 7 (
<figureCitation id="62BD26EF827F652466D7FD67FB3FB4A2" box="[1201,1275,693,719]" captionStart="FIGURE 5" captionStartId="7.[151,255,1974,1998]" captionTargetBox="[168,1418,194,1950]" captionTargetId="figure@7.[168,1419,194,1950]" captionTargetPageId="7" captionText="FIGURE 5. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187540/files/figure.png" pageId="12" pageNumber="13">Fig. 5</figureCitation>
): coxa small; basis posteriorly expanded, meral lobe 1/3 (P6) and 1/2 (P7) of carpus, both P6 and P7 with a series of simple paired setae on anterior margin og merus and carpus, dactylus weakly serrate. These two legs are more &quot;sturdy&quot; than pereopods 3–5, with broader limbs and coarser armament. P 5–7 slightly longer than P 3–4.
</paragraph>
<paragraph id="FA393A6A827F652462A3FC82FDAEB246" blockId="12.[151,1437,152,2034]" pageId="12" pageNumber="13">
Urosome (
<figureCitation id="62BD26EF827F65246359FC82FE42B507" box="[319,390,848,874]" captionStart="FIGURE 5" captionStartId="7.[151,255,1974,1998]" captionTargetBox="[168,1418,194,1950]" captionTargetId="figure@7.[168,1419,194,1950]" captionTargetPageId="7" captionText="FIGURE 5. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187540/files/figure.png" pageId="12" pageNumber="13">Fig. 5</figureCitation>
): smooth. Epimeral plate 3 (
<figureCitation id="62BD26EF827F652460B7FC82FCDCB507" box="[721,792,848,874]" captionStart="FIGURE 5" captionStartId="7.[151,255,1974,1998]" captionTargetBox="[168,1418,194,1950]" captionTargetId="figure@7.[168,1419,194,1950]" captionTargetPageId="7" captionText="FIGURE 5. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187540/files/figure.png" pageId="12" pageNumber="13">Fig. 5</figureCitation>
): rounded. Uropod 1 (
<figureCitation id="62BD26EF827F6524667AFC82FBA7B507" box="[1052,1123,848,874]" captionStart="FIGURE 5" captionStartId="7.[151,255,1974,1998]" captionTargetBox="[168,1418,194,1950]" captionTargetId="figure@7.[168,1419,194,1950]" captionTargetPageId="7" captionText="FIGURE 5. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187540/files/figure.png" pageId="12" pageNumber="13">Fig. 5</figureCitation>
): longer than uropod 2; biramous, peduncle and rami subequal length. Uropod 2 (
<figureCitation id="62BD26EF827F65246146FCA4FCA3B5FD" box="[800,871,886,912]" captionStart="FIGURE 5" captionStartId="7.[151,255,1974,1998]" captionTargetBox="[168,1418,194,1950]" captionTargetId="figure@7.[168,1419,194,1950]" captionTargetPageId="7" captionText="FIGURE 5. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187540/files/figure.png" pageId="12" pageNumber="13">Fig. 5</figureCitation>
): longer than uropod 3; peduncle slightly longer than rami, 6 simple and short setae; inner ramus longer than outer ramus, inner ramus with two short and simple setae near basis. Uropod 3 (
<figureCitation id="62BD26EF827F65246026FC16FD4FB5B3" box="[576,651,964,990]" captionStart="FIGURE 5" captionStartId="7.[151,255,1974,1998]" captionTargetBox="[168,1418,194,1950]" captionTargetId="figure@7.[168,1419,194,1950]" captionTargetPageId="7" captionText="FIGURE 5. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187540/files/figure.png" pageId="12" pageNumber="13">Fig. 5</figureCitation>
): uniramous, ramus with two articles; peduncle as long as ramus article 1. Telson (
<figureCitation id="62BD26EF827F65246302FC38FE68B269" box="[356,428,1002,1028]" captionStart="FIGURE 5" captionStartId="7.[151,255,1974,1998]" captionTargetBox="[168,1418,194,1950]" captionTargetId="figure@7.[168,1419,194,1950]" captionTargetPageId="7" captionText="FIGURE 5. Metopa clypeata Krøyer, 1842, female syntype, 8.9 mm, Greenland: pereopod 5, pereopod 6, pereopod 7, urosome, uropod 1, uropod 2, uropod 3, telson. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187540/files/figure.png" pageId="12" pageNumber="13">Fig. 5</figureCitation>
): rounded, with a single pair of small marginal robust setae and a few minute setules, slightly shorter than peduncle uropod 3.
</paragraph>
<paragraph id="FA393A6A827F652462A3FBEAFAF5B23F" blockId="12.[151,1437,152,2034]" box="[197,1329,1080,1106]" pageId="12" pageNumber="13">
Sexual differences: there are, unlike in many other 
<taxonomicName id="3D8641E9827F6524617AFBEAFCB2B23C" box="[796,886,1080,1105]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="12" pageNumber="13" phylum="Arthropoda" rank="genus">
<emphasis id="C8F2E678827F6524617AFBEAFCB2B23C" box="[796,886,1080,1105]" italics="true" pageId="12" pageNumber="13">Metopa</emphasis>
</taxonomicName>
species, not many sexual differences.
</paragraph>
</subSubSection>
<subSubSection id="B29C69E1827F652462A3FB8CFBA4B3C3" pageId="12" pageNumber="13" type="distribution">
<paragraph id="FA393A6A827F652462A3FB8CFB84B37E" blockId="12.[151,1437,152,2034]" pageId="12" pageNumber="13">
<emphasis id="C8F2E678827F652462A3FB8CFEA3B215" bold="true" box="[197,359,1118,1144]" pageId="12" pageNumber="13">Distribution:</emphasis>
found in a variety of localities (see 
<figureCitation id="62BD26EF827F65246176FB8CFCA3B215" box="[784,871,1118,1144]" captionStart="FIGURE 22" captionStartId="30.[151,255,1950,1974]" captionTargetBox="[153,1435,191,1949]" captionTargetId="figure@30.[151,1436,151,1953]" captionTargetPageId="30" captionText="FIGURE 22. Geographic distribution of A: Metopa clypeata and B: M. glacialis An additional record from the Sea of Japan is not on the map due to missing locality-information." httpUri="https://zenodo.org/record/187557/files/figure.png" pageId="12" pageNumber="13">Fig. 22</figureCitation>
, map A): East- and West-Greenland (Godthaab/ Nuuk is 
<typeStatus id="253D84C8827F65246363FB57FEF8B2F2" box="[261,316,1157,1183]" pageId="12" pageNumber="13">type</typeStatus>
locality) (
<bibRefCitation id="9E17479B827F652463A5FB57FDB7B2F2" author="Kroyer" box="[451,627,1157,1183]" pageId="12" pageNumber="36" refString="Kroyer, H. (1842) Nye nordiske Slaegter og Arter af Amfipodernes Orden, henhorende til Familien Gammarina. Naturhistorisk Tidsskrift, 4, 141 - 166." type="journal article" year="1842">Krøyer, 1842</bibRefCitation>
; 
<bibRefCitation id="9E17479B827F652460E7FB57FCCDB2F2" author="Just" box="[641,777,1157,1183]" pageId="12" pageNumber="36" refString="Just, J. (1980) Amphipoda (Crustacea) of the Thule area, northwest Greenland: faunistics and taxonomy. Meddelelser om Gronland Bioscience, 2, 1 - 61." type="journal article" year="1980">Just, 1980</bibRefCitation>
), Bering Sea (
<bibRefCitation id="9E17479B827F652461A7FB57FBB5B2F2" author="Kroyer" box="[961,1137,1157,1183]" pageId="12" pageNumber="36" refString="Kroyer, H. (1842) Nye nordiske Slaegter og Arter af Amfipodernes Orden, henhorende til Familien Gammarina. Naturhistorisk Tidsskrift, 4, 141 - 166." type="journal article" year="1842">Krøyer, 1842</bibRefCitation>
), Point Barrow, Alaska (
<bibRefCitation id="9E17479B827F652462F9FB7EFEB2B2AB" author="Shoemaker" box="[159,374,1196,1222]" pageId="12" pageNumber="36" refString="Shoemaker, C. R. (1955) Amphipoda collected at the Arctic Laboratory, Office of Naval Research, Point Barrow, Alaska, by G. E. MacGinitie. Smithsonian Miscellaneous Collections, 128 (1), 1 - 78." type="journal article" year="1955">Shoemaker, 1955</bibRefCitation>
), and Gulf of St Lawrence (
<bibRefCitation id="9E17479B827F652460AEFB7EFC59B2AB" author="Shoemaker" box="[712,925,1196,1222]" pageId="12" pageNumber="36" refString="Shoemaker, C. R. (1930) The amphipods of the Cheticamp expedition of 1917. Contributions to Canadian Biology and Fisheries New Series, 5 (10), 221 - 359." type="journal article" year="1930">Shoemaker, 1930</bibRefCitation>
) at depths varying from 
<quantity id="3D7E978F827F652466ACFB7EFA9CB2AB" box="[1226,1368,1196,1222]" metricMagnitude="2" metricUnit="m" metricValue="1.6" metricValueMax="3.0" metricValueMin="0.2" pageId="12" pageNumber="13" unit="m" value="160.0" valueMax="300.0" valueMin="20.0">
20 to 
<specimenCount id="EC80F1E3827F65246776FB7EFA9CB2AB" box="[1296,1368,1196,1222]" pageId="12" pageNumber="13" type="generic">300m</specimenCount>
</quantity>
. Also some curious older and not verified reports from the Bohuslän coast (south-west 
<collectingCountry id="82917AFA827F6524663FFB00FB7FB281" box="[1113,1211,1234,1260]" name="Sweden" pageId="12" pageNumber="13">Sweden</collectingCountry>
), Banff (
<collectingCountry id="82917AFA827F65246744FB00FA4BB281" box="[1314,1423,1234,1260]" name="United Kingdom" pageId="12" pageNumber="13">Scotland</collectingCountry>
), Kristiansund (Western 
<collectingCountry id="82917AFA827F652463C2FB2BFDC0B37E" box="[420,516,1273,1299]" name="Norway" pageId="12" pageNumber="13">Norway</collectingCountry>
) and Tromsø (Northern 
<collectingCountry id="82917AFA827F65246147FB2BFC45B37E" box="[801,897,1273,1299]" name="Norway" pageId="12" pageNumber="13">Norway</collectingCountry>
) (
<bibRefCitation id="9E17479B827F652461FFFB2BFBF7B37E" author="Boeck" box="[921,1075,1273,1299]" pageId="12" pageNumber="35" refString="Boeck, A. (1872) De Skandinaviske og Arktiske Amphipoder. A. W. Brogger, Christiania, 160 pp." type="book" year="1872">Boeck, 1872</bibRefCitation>
).
</paragraph>
<paragraph id="FA393A6A827F652462A3FACDFF27B3EA" blockId="12.[151,1437,152,2034]" pageId="12" pageNumber="13">
<emphasis id="C8F2E678827F652462A3FACDFEF7B354" bold="true" box="[197,307,1311,1337]" pageId="12" pageNumber="13">Ecology:</emphasis>
little known. A cold-water species. All records are of apparently free-living animals, although some of the older records mentions it living &quot;on 
<emphasis id="C8F2E678827F652460B9FA95FCA1B30D" box="[735,869,1351,1376]" italics="true" pageId="12" pageNumber="13">Sertulariae</emphasis>
&quot; (
<bibRefCitation id="9E17479B827F652461E4FA94FBE7B30D" author="Kroyer" box="[898,1059,1350,1376]" pageId="12" pageNumber="36" refString="Kroyer, H. (1845) Karcinologiske Bidrag (fortsaettelse). Naturhistorisk Tidsskrift, NS vol. 1 pp 453 - 638." type="book chapter" year="1845">Krøyer, 1845</bibRefCitation>
) or &quot;on 
<taxonomicName id="3D8641E9827F652466E1FA95FB2BB30D" authority="Stephensen, 1931" authorityName="Stephensen" authorityYear="1931" box="[1159,1263,1351,1376]" class="Hydrozoa" family="Sertulariidae" genus="Thujaria" higherTaxonomySource="CoL" kingdom="Animalia" order="Leptothecata" pageId="12" pageNumber="13" phylum="Cnidaria" rank="genus">
<emphasis id="C8F2E678827F652466E1FA95FB2BB30D" box="[1159,1263,1351,1376]" italics="true" pageId="12" pageNumber="13">Thujaria</emphasis>
</taxonomicName>
&quot; (
<bibRefCitation id="9E17479B827F6524676DFA94FF12B3EA" author="Stephensen" pageId="12" pageNumber="36" refString="Stephensen, K. (1931) Crustacea Malacostraca. VII. (Amphipoda. III.). The Danish Ingolf-Expedition, 3 (11), 179 - 290." type="journal article" year="1931">Stephensen, 1931</bibRefCitation>
).
</paragraph>
<paragraph id="FA393A6A827F652462A3FA46FBA4B3C3" blockId="12.[151,1437,152,2034]" box="[197,1120,1428,1454]" pageId="12" pageNumber="13">
The name 
<taxonomicName id="3D8641E9827F65246326FA46FE65B3C3" box="[320,417,1428,1454]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="12" pageNumber="13" phylum="Arthropoda" rank="species" species="clypeata">clypeata</taxonomicName>
(shield-bearer) from clypeis (lat.) refers to the large coxa 4.
</paragraph>
</subSubSection>
<subSubSection id="B29C69E1827F652562A3FA68FC9BB692" lastPageId="13" lastPageNumber="14" pageId="12" pageNumber="13" type="materials_examined">
<paragraph id="FA393A6A827F652462A3FA68FD7AB396" blockId="12.[151,1437,152,2034]" pageId="12" pageNumber="13">
<emphasis id="C8F2E678827F652462A3FA68FE54B3B9" bold="true" box="[197,400,1466,1492]" pageId="12" pageNumber="13">Other material.</emphasis>
USNMNH (419533, male, 
<quantity id="3D7E978F827F65246082FA68FCEAB3B9" box="[740,814,1466,1492]" metricMagnitude="-3" metricUnit="m" metricValue="7.0" pageId="12" pageNumber="13" unit="mm" value="7.0">7 mm</quantity>
, Albatross station 3282, Bering Sea), (male, 
<quantity id="3D7E978F827F65246730FA68FA5CB3B9" box="[1366,1432,1466,1492]" metricMagnitude="-3" metricUnit="m" metricValue="7.0" pageId="12" pageNumber="13" unit="mm" value="7.0">7mm</quantity>
, station 3279 Bering sea), see 
<figureCitation id="62BD26EF827F65246389FA33FDF2B396" box="[495,566,1505,1531]" captionStart="FIGURE 6" captionStartId="8.[151,256,1976,2000]" captionTargetBox="[219,1354,194,1945]" captionTargetId="figure@8.[219,1354,194,1946]" captionTargetPageId="8" captionText="FIGURE 6. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: left mandible, right mandible, labrum, labium, maxilla 1, maxilla 2, maxilliped. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187541/files/figure.png" pageId="12" pageNumber="13">Fig. 6</figureCitation>
, 
<figureCitation id="62BD26EF827F65246025FA33FD90B396" box="[579,596,1505,1531]" captionStart="FIGURE 7" captionStartId="9.[151,258,1965,1989]" captionTargetBox="[205,1385,194,1938]" captionTargetId="figure@9.[205,1386,194,1939]" captionTargetPageId="9" captionText="FIGURE 7. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: gnathopod 1, gnathopod 2, pereopod 3. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187542/files/figure.png" pageId="12" pageNumber="13">7</figureCitation>
, 
<figureCitation id="62BD26EF827F65246006FA33FDABB396" box="[608,623,1505,1531]" captionStart="FIGURE 8" captionStartId="10.[151,256,1936,1960]" captionTargetBox="[253,1312,194,1905]" captionTargetId="figure@10.[253,1313,194,1906]" captionTargetPageId="10" captionText="FIGURE 8. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: pereopod 4, telson, uropod 1, uropod 2, uropod 3. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187543/files/figure.png" pageId="12" pageNumber="13">8</figureCitation>
and 
<figureCitation id="62BD26EF827F652460C1FA33FD7DB396" box="[679,697,1505,1531]" captionStart="FIGURE 9" captionStartId="11.[151,259,1942,1966]" captionTargetBox="[208,1382,194,1911]" captionTargetId="figure@11.[208,1383,194,1911]" captionTargetPageId="11" captionText="FIGURE 9. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: pereopod 5, pereopod 6, pereopod 7, urosome. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187544/files/figure.png" pageId="12" pageNumber="13">9</figureCitation>
.
</paragraph>
<paragraph id="FA393A6A827F652462A3F9DAFE80B15D" blockId="12.[151,1437,152,2034]" pageId="12" pageNumber="13">
Head and antennae as in 
<typeStatus id="253D84C8827F65246396F9DAFDE7B04F" box="[496,547,1544,1570]" pageId="12" pageNumber="13">type</typeStatus>
from 
<collectionCode id="9C97A2AF827F6524600BF9DAFD01B04F" box="[621,709,1544,1570]" httpUri="http://grbio.org/cool/mci8-ehqk" name="Zoological Museum, University of Copenhagen" pageId="12" pageNumber="13">ZMUC</collectionCode>
, most mouthparts (except from those mentioned under) as in type-material. Mandibles: one specimen with left mandible palp 2-articulate and right mandible palp 3- articulate (see 
<figureCitation id="62BD26EF827F65246320F987FE4AB002" box="[326,398,1621,1647]" captionStart="FIGURE 6" captionStartId="8.[151,256,1976,2000]" captionTargetBox="[219,1354,194,1945]" captionTargetId="figure@8.[219,1354,194,1946]" captionTargetPageId="8" captionText="FIGURE 6. Metopa clypeata Krøyer, 1842, from USNMNH, male, 7 mm, Bering Sea: left mandible, right mandible, labrum, labium, maxilla 1, maxilla 2, maxilliped. All scale bars are 0.1 mm." httpUri="https://zenodo.org/record/187541/files/figure.png" pageId="12" pageNumber="13">Fig. 6</figureCitation>
), the other specimen with both mandible palps 3-articulate. The 2-articulate palp has a short article 1 and a 
<date id="8E381CAA827F652463EEF9AEFE62B0FB" box="[392,422,1660,1686]" pageId="12" pageNumber="13">4x</date>
longer article 2, whereas the 3-articulate palps has a very small article 3 added to this &quot;formula&quot;, this article looks very much like the minuscle article 
<quantity id="3D7E978F827F652461FAF970FC0EB0D1" box="[924,970,1698,1724]" metricMagnitude="-2" metricUnit="m" metricValue="5.08" pageId="12" pageNumber="13" unit="in" value="2.0">2 in</quantity>
the palps of the type-specimens, palps with circular cross-section. Lacinia mobilis at left mandible, both mandibles with a row of plumose raker setae, and no molar. Labrum: asymmetrically bilobed. Maxilliped: long and slim, inner plates well separate, else as in 
<typeStatus id="253D84C8827F6524636FF8C4FEFBB15D" box="[265,319,1814,1840]" pageId="12" pageNumber="13">type</typeStatus>
.
</paragraph>
<paragraph id="FA393A6A827F652462A3F8EFFD62B13A" blockId="12.[151,1437,152,2034]" box="[197,678,1853,1879]" pageId="12" pageNumber="13">
Pereon: as in 
<typeStatus id="253D84C8827F65246305F8EFFE5DB13A" box="[355,409,1853,1879]" pageId="12" pageNumber="13">type</typeStatus>
. Pereopods: as in 
<typeStatus id="253D84C8827F6524600AF8EFFD66B13A" box="[620,674,1853,1879]" pageId="12" pageNumber="13">type</typeStatus>
.
</paragraph>
<paragraph id="FA393A6A827F652462A3F8B6FE73B113" blockId="12.[151,1437,152,2034]" box="[197,439,1892,1918]" pageId="12" pageNumber="13">
Urosome: as in 
<typeStatus id="253D84C8827F6524631BF8B6FE77B113" box="[381,435,1892,1918]" pageId="12" pageNumber="13">type</typeStatus>
.
</paragraph>
<paragraph id="FA393A6A827F652562A3F858FC9BB692" blockId="12.[151,1437,152,2034]" lastBlockId="13.[151,1437,152,1531]" lastPageId="13" lastPageNumber="14" pageId="12" pageNumber="13">
We have also examined specimens labelled as 
<taxonomicName id="3D8641E9827F65246083F859FC6DB1C9" box="[741,937,1931,1956]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="12" pageNumber="13" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827F65246083F859FC6DB1C9" box="[741,937,1931,1956]" italics="true" pageId="12" pageNumber="13">Metopa clypeata</emphasis>
</taxonomicName>
from the Russian Academy of Sciences in St Petersburg: these were clearly not 
<taxonomicName id="3D8641E9827F65246032F863FD26B1A7" box="[596,738,1969,1994]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="12" pageNumber="13" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827F65246032F863FD26B1A7" box="[596,738,1969,1994]" italics="true" pageId="12" pageNumber="13">M. clypeata</emphasis>
</taxonomicName>
as the gnathopod 1 propodus was subchelate with a shape more resembling 
<taxonomicName id="3D8641E9827F65246316F80AFDC1B19C" box="[368,517,2008,2033]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="12" pageNumber="13" phylum="Arthropoda" rank="species" species="glacialis">
<emphasis id="C8F2E678827F65246316F80AFDC1B19C" box="[368,517,2008,2033]" italics="true" pageId="12" pageNumber="13">M. glacialis</emphasis>
</taxonomicName>
and 
<taxonomicName id="3D8641E9827F65246025F80AFCD4B19C" box="[579,784,2008,2033]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="12" pageNumber="13" phylum="Arthropoda" rank="species" species="groenlandica">
<emphasis id="C8F2E678827F65246025F80AFCD4B19C" box="[579,784,2008,2033]" italics="true" pageId="12" pageNumber="13">M. groenlandica</emphasis>
</taxonomicName>
. We have not yet examined further what species the specimens from St Petersburg are, as they were not any longer interesting for this re-description, but we have eliminated all records of 
<taxonomicName id="3D8641E9827E652563B0FF6DFDAFB6B5" box="[470,619,191,216]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827E652563B0FF6DFDAFB6B5" box="[470,619,191,216]" italics="true" pageId="13" pageNumber="14">M. clypeata</emphasis>
</taxonomicName>
from Gurjanova (southern Kara Sea, 
<bibRefCitation id="9E17479B827E6525662CFF6CFADBB6B5" author="Gurjanova" box="[1098,1311,190,216]" pageId="13" pageNumber="35" refString="Gurjanova, E. F. (1933) Zur Amphipodenfauna des Karischen Meeres. Zoologischer Anzeiger, 103, 119 - 128." type="journal article" year="1933">Gurjanova, 1933</bibRefCitation>
) from the distribution, until all her material is thoroughly re-examined.
</paragraph>
</subSubSection>
<subSubSection id="B29C69E1827E652562A3FED9FBD9B396" pageId="13" pageNumber="14" type="discussion">
<paragraph id="FA393A6A827E652562A3FED9FCABB436" blockId="13.[151,1437,152,1531]" pageId="13" pageNumber="14">
<emphasis id="C8F2E678827E652562A3FED9FE8CB748" bold="true" box="[197,328,267,293]" pageId="13" pageNumber="14">Remarks.</emphasis>
The most curious deviation between the 
<typeStatus id="253D84C8827E6525613AFEDEFC57B74B" box="[860,915,268,294]" pageId="13" pageNumber="14">type</typeStatus>
material and the other material we have examined, is the number of articles in the mandible palps. In Krøyers material from 
<collectingCountry id="82917AFA827E65256619FEE0FB39B721" box="[1151,1277,306,332]" name="Greenland" pageId="13" pageNumber="14">Greenland</collectingCountry>
, all mandible palps are 2-articulate, with a long first article, and a minimal second article. The SEM-pictures show, however, that there has been an additional articulation further to the base of the now first article, but there is an entire unbroken cuticulum over this articulation in both mandibles we have SEM of, and in lightmicroscopy this is not possible to see at all. Even more interesting it is then, when one of the dissected 
<taxonomicName id="3D8641E9827E6525671AFE1FFF3FB460" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827E6525671AFE1FFF3FB460" italics="true" pageId="13" pageNumber="14">M. clypeata</emphasis>
</taxonomicName>
from NMNH had right mandible palp 3-articulate and left mandible palp 2-articulate, while another specimen has both mandible palps 3-articulate. The articulation of the palp might be a plastic character that should not be used for identification or phylogenetic analyses.
</paragraph>
<paragraph id="FA393A6A827E652562A3FDBAFEADB52E" blockId="13.[151,1437,152,1531]" pageId="13" pageNumber="14">
Another interesting aspect is the accessory flagellum reported by 
<bibRefCitation id="9E17479B827E652561B7FDBAFB9EB4EF" author="Just" box="[977,1114,616,642]" pageId="13" pageNumber="36" refString="Just, J. (1980) Amphipoda (Crustacea) of the Thule area, northwest Greenland: faunistics and taxonomy. Meddelelser om Gronland Bioscience, 2, 1 - 61." type="journal article" year="1980">Just (1980)</bibRefCitation>
. He has observed the same type-material we have, but he observed a tiny 1-articulate accessory flagellum on 
<taxonomicName id="3D8641E9827E652566E0FD5DFF25B4A2" authority="Just, 1980" authorityName="Just" authorityYear="1980" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827E652566E0FD5DFA96B4C5" box="[1158,1362,655,680]" italics="true" pageId="13" pageNumber="14">Metopa clypeata</emphasis>
(
<bibRefCitation id="9E17479B827E65256702FD5CFF1CB4A2" author="Just" pageId="13" pageNumber="36" refString="Just, J. (1980) Amphipoda (Crustacea) of the Thule area, northwest Greenland: faunistics and taxonomy. Meddelelser om Gronland Bioscience, 2, 1 - 61." type="journal article" year="1980">Just, 1980</bibRefCitation>
)
</taxonomicName>
. We have not been able to observe an accessory flagellum. Just also found this very small accessory flagellum in other 
<taxonomicName id="3D8641E9827E6525631FFD0EFE11B498" box="[377,469,732,757]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="13" pageNumber="14" phylum="Arthropoda" rank="genus">
<emphasis id="C8F2E678827E6525631FFD0EFE11B498" box="[377,469,732,757]" italics="true" pageId="13" pageNumber="14">Metopa</emphasis>
</taxonomicName>
species he examined from 
<collectingCountry id="82917AFA827E65256146FD0EFC65B49B" box="[800,929,732,758]" name="Greenland" pageId="13" pageNumber="14">Greenland</collectingCountry>
. From all the 
<taxonomicName id="3D8641E9827E6525662DFD0EFB63B498" box="[1099,1191,732,757]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="13" pageNumber="14" phylum="Arthropoda" rank="genus">
<emphasis id="C8F2E678827E6525662DFD0EFB63B498" box="[1099,1191,732,757]" italics="true" pageId="13" pageNumber="14">Metopa</emphasis>
</taxonomicName>
specimens from the ZMUC-collections we have examined, none have had accessory flagella, or they are so tiny that they can be called “vestigial”.
</paragraph>
<paragraph id="FA393A6A827E652562A3FC82FD8FB5B3" blockId="13.[151,1437,152,1531]" pageId="13" pageNumber="14">
<bibRefCitation id="9E17479B827E652562A3FC82FE83B507" author="Just" box="[197,327,848,874]" pageId="13" pageNumber="36" refString="Just, J. (1980) Amphipoda (Crustacea) of the Thule area, northwest Greenland: faunistics and taxonomy. Meddelelser om Gronland Bioscience, 2, 1 - 61." type="journal article" year="1980">Just (1980)</bibRefCitation>
also emphasizes the epistome and median cephalic front margin complex as an area of species specific morphological differences, but in his Greenland-material he did not encounter any 
<taxonomicName id="3D8641E9827E652566B0FCA5FAA6B5FD" box="[1238,1378,887,912]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827E652566B0FCA5FAA6B5FD" box="[1238,1378,887,912]" italics="true" pageId="13" pageNumber="14">M. clypeata</emphasis>
</taxonomicName>
, and he did thus not examine this species in more detail for the aforementioned characters, which were thought by him to be of genus-defining capacity.
</paragraph>
<paragraph id="FA393A6A827E652562A3FC38FC3CB2F2" blockId="13.[151,1437,152,1531]" pageId="13" pageNumber="14">
<bibRefCitation id="9E17479B827E652562A3FC38FDC8B269" author="Barnard" box="[197,524,1002,1028]" pageId="13" pageNumber="35" refString="Barnard, J. L. &amp; Karaman, G. S. (1991) The families and genera of marine gammaridean Amphipoda (except marine gammaroids). Part 2. Records of the Australian Museum Supplement, 13 (2), 419 - 866." type="journal article" year="1991">Barnard &amp; Karaman (1991)</bibRefCitation>
defines the inner plate of the maxilliped to be &quot;mostly fused together or well separated (
<typeStatus id="253D84C8827E6525637FFBC3FE90B246" box="[281,340,1041,1067]" pageId="13" pageNumber="14">type</typeStatus>
)&quot;. As is seen from our examinations of both type-material and the USNMNH material, that Barnard most likely examined, the condition of the inner plates seems to fit the same pattern as the articulation of the mandible palp, with fused inner plates in the type-material and well separated plates in the USNMNH-material. This character is discussed further later in this paper.
</paragraph>
<paragraph id="FA393A6A827E652562A3FB7EFAEEB3C3" blockId="13.[151,1437,152,1531]" pageId="13" pageNumber="14">
Both 
<bibRefCitation id="9E17479B827E6525636CFB7EFE05B2AB" author="Hansen" box="[266,449,1196,1222]" pageId="13" pageNumber="36" refString="Hansen, H. J. (1888) Malacostraca marina Groenlandiae occidentalis. Oversigt over det vestlige Gronlands Fauna af malakostrake Havkrebsdyr. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening, 1887, 5 - 226." type="journal article" year="1888">Hansen (1888)</bibRefCitation>
and 
<bibRefCitation id="9E17479B827E65256066FB7EFD22B2AB" author="Shoemaker" box="[512,742,1196,1222]" pageId="13" pageNumber="36" refString="Shoemaker, C. R. (1955) Amphipoda collected at the Arctic Laboratory, Office of Naval Research, Point Barrow, Alaska, by G. E. MacGinitie. Smithsonian Miscellaneous Collections, 128 (1), 1 - 78." type="journal article" year="1955">Shoemaker (1955)</bibRefCitation>
mention that the male and female are very alike in this species. This is what we find as well, and Shoemaker’s comments that the female gnathopod 2 &quot;is not so strongly built and the characters not so pronounced, but it closely resembles that of the male&quot; still holds as the best description of any sexual differences. 
<bibRefCitation id="9E17479B827E652560EBFAF2FCEAB357" author="Boeck" box="[653,814,1312,1338]" pageId="13" pageNumber="35" refString="Boeck, A. (1872) De Skandinaviske og Arktiske Amphipoder. A. W. Brogger, Christiania, 160 pp." type="book" year="1872">Boeck (1872)</bibRefCitation>
mentions that the third article of antenna 1 peduncle is shorter in females than in males. We have not been able to verify this, but that might be due to the small number of females we have observed, and the fact that the female we observed was slightly larger than the males. We have not seen any specific sexual difference in size; this is also supported by Shoemaker.
</paragraph>
<paragraph id="FA393A6A827E652562A3FA69FBD9B396" blockId="13.[151,1437,152,1531]" pageId="13" pageNumber="14">
The insufficiently described taxon 
<taxonomicName id="3D8641E9827E652560E3FA69FB8EB3B8" authority="Oldevig, 1959" authorityName="Oldevig" authorityYear="1959" box="[645,1098,1467,1493]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="beringiensis">
<emphasis id="C8F2E678827E652560E3FA69FC4EB3B9" box="[645,906,1467,1492]" italics="true" pageId="13" pageNumber="14">Metopa beringiensis</emphasis>
<bibRefCitation id="9E17479B827E652561F5FA69FB8EB3B8" author="Oldevig" box="[915,1098,1467,1493]" pageId="13" pageNumber="36" refString="Oldevig, H. (1959) Arctic, subarctic and Scandinavian amphipods in the collections of the Swedish Natural History Museum in Stockholm. Meddelanden fran Goteborgs Musei Zoologiska Avdelning, 127, 1 - 132." type="journal article" year="1959">Oldevig, 1959</bibRefCitation>
</taxonomicName>
looks, as far as the scarce description and illustrations permit a conclusion, very similar to 
<taxonomicName id="3D8641E9827E652561EAFA33FBD2B397" box="[908,1046,1505,1530]" class="Malacostraca" family="Stenothoidae" genus="Metopa" kingdom="Animalia" order="Amphipoda" pageId="13" pageNumber="14" phylum="Arthropoda" rank="species" species="clypeata">
<emphasis id="C8F2E678827E652561EAFA33FBD2B397" box="[908,1046,1505,1530]" italics="true" pageId="13" pageNumber="14">M. clypeata</emphasis>
</taxonomicName>
.
</paragraph>
</subSubSection>
</treatment>
</document>