Two new species of the genus Syngastes (Copepoda, Harpacticoida, Tegastidae) from South Korea

in Crustaceana
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Herein two new species of the genus Syngastes Monard, 1924 are described from South Korea, with detailed descriptions and illustrations. Both new copepods, Syngastes multicavus sp. nov. and S. pseudofoveatus sp. nov., have two inner setae on the first exopodal segment of P2 and P3. Syngastes multicavus sp. nov. most closely resembles S. gibbosus Bartsch, 1999 reported from Australia, as they both have a five-segmented antennule in the female. However, Syngastes multicavus sp. nov. has a rounded body outline instead of the gibbose outline observed in S. gibbosus. Syngastes pseudofoveatus sp. nov. resembles S. foveatus Bartsch, 1994 in almost all aspects. However, they differ clearly in the number of setae on the first exopodal segment of P2 and P3. We also provide a key to species of the genus Syngastes worldwide. The present study is the first record of the family Tegastidae in Korean waters.

Two new species of the genus Syngastes (Copepoda, Harpacticoida, Tegastidae) from South Korea

in Crustaceana

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References

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Figures

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    Syngastes multicavus sp. nov., female. A, habitus, lateral; B, urosome, posterior; C, caudal ramus; D, antennule. Scale bars: A, 100 μm; B, 50 μm; C, D, 30 μm.

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    Syngastes multicavus sp. nov., female. A, antenna; B, labrum; C, mandible; D, mandibular gnathobase; E, maxillule; F, maxilla; G, maxilliped. Scale bar: A-G, 30 μm.

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    Syngastes multicavus sp. nov., female. A-E, P1-P5; F, P5 depressed by cover slip. Scale bars: A-F, 50 μm.

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    Syngastes multicavus sp. nov., male. A, habitus, lateral; B, urosome, lateral; C, antennule; D, middle inner seta on P4 exp-3; E, P5. Scale bars: A, 100 μm; B, 50 μm; C-E, 30 μm.

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    Syngastes multicavus sp. nov., scanning electron micrographs, female. A, habitus, lateral; B, cephalothorax, lateral; C, outer margin of thoracic somites; D, ventroposterior corner of cephalic shield; E, antennule; F, P5.

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    Syngastes multicavus sp. nov., scanning electron micrographs, female. A, urosome; B, posteror margin of genital complex; C, posterior portion of urosome, lateral; D, habitus, ventral; E, anterior portion of cephalosome, ventral; F, urosome, posterior.

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    Syngastes multicavus sp. nov., scanning electron micrographs, female. A, ventral portion of genital complex, ventral; B, posterior portion of urosome, posterior, C, caudal ramus, posterior; D, portion of maxilliped, ventral.

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    Syngastes multicavus sp. nov., scanning electron micrographs, male. A, habitus, lateral; B, C, urosomite, lateral; D, antennule, lateral; E, palmar margin of maxilliped, lateral; F, distal portion of middle inner seta on P4 exp-3.

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    Syngastes pseudofoveatus sp. nov., female. A, habitus, lateral; B, urosome, lateral; C, urosome, posterior; D, caudal rami; E, antennule; F, antenna; G, mandible. Scale bars: A-C, 50 μm; D-G, 30 μm.

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    Syngastes pseudofoveatus sp. nov., female. A, maxillule; B, maxilla; C, maxilliped; D-F, P1-P3. Scale bars: A-F, 30 μm.

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    Syngastes pseudofoveatus sp. nov., female (A, B): A, P4; B, P5. Male (C-F): C, habitus, lateral; D, antennule; E, caudal ramus; F, P5. Scale bars: A-F, 30 μm.

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    Syngastes pseudofoveatus sp. nov., scanning electron micrographs, female: A, habitus, lateral; B, cephalothrax, lateral; C, D, urosome, lateral and posterolateral, E, surfaces of basis and enp-1 on P4; F, P5.

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    Syngastes pseudofoveatus sp. nov., scanning electron micrographs, female. A, habitus, ventral; B, C, cephalosome, ventral; D, thoracic somites, ventral; E, F, maxilliped, ventral.

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    Syngastes pseudofoveatus sp. nov., scanning electron micrographs, male. A, habitus, lateral; B, urosome, lateral; C, antennule, lateral; D, proximal portion of maxilliped; E, habitus, ventral; F, urosome, ventral.

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