Two new lysianassoid amphipods of the genus Orchomenella (Amphipoda, Lysianassoidea, Lysianassidae, Tryphosinae) from South Korea

in Crustaceana
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Two new species of the genus Orchomenella G. O. Sars, 1890 from South Korea are described here in detail. Orchomenella paucisetigera sp. nov. is characterized by an irregular and serrated palmar margin of gnathopod 1, non-serrated posterior margins of pleonal epimera 2-3, a more produced posteroventral corner of pleonal epimeron 3, and scarcely setose uropods 1-2. Orchomenella rugosa sp. nov. is easily discriminated from other congeners by its proximally slender basis and irregular palmar margin of gnathopod 1, marginal wrinkles ventrally of coxa 4, and the serrations and shapes of pleonal epimera and urosomite 1.

Crustaceana

International Journal of Crustacean Research

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References

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Figures

  • Orchomenella paucisetigera sp. nov., holotype, female, 5.9 mm, NIBRIV0000806534. A, habitus; B, head; C, antenna 1, lateral; D, antenna 1, medial; E, antenna 2; F, lower lip; G, left mandible; H, right mandible. Scale bars: A, 0.5 mm; B, C, F, 0.2 mm; D, E, G, H, 0.1 mm.

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  • Orchomenella paucisetigera sp. nov., holotype, female, 5.9 mm, NIBRIV0000806534. A, maxilla 1; B, inner plate of maxilla 1; C, maxilla 2; D, maxilliped; E, inner plate of maxilliped; F, gnathopod 1; G, palm and dactylus of gnathopod 1; H, gnathopod 2; I, palm and dactylus of gnathopod 2. Scale bars: A-C, I, 0.05 mm; D, E, G, 0.1 mm; F, H, 0.2 mm.

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  • Orchomenella paucisetigera sp. nov., holotype, female, 5.9 mm, NIBRIV0000806534. A, pereopod 3; B, pereopod 4; C, pereopod 5; D, pereopod 6; E, pereopod 7; F, epimeral plates; G, uropod 1; H, uropod 2; I, uropod 3; J, telson. Scale bars: A-J, 0.2 mm.

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  • Orchomenella rugosa sp. nov., holotype, male, 5.6 mm, NIBRIV0000806533. A, habitus; B, head; C, antenna 1, lateral; D, antenna 1, medial; E, peduncular articles of antenna 2; F, right mandible; G, left mandible. Scale bars: A, B, 0.5 mm; C, D, 0.2 mm; E-G, 0.1 mm.

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  • Orchomenella rugosa sp. nov., holotype, male, 5.6 mm, NIBRIV0000806533. A, maxilla 1; B, inner plate of maxilla 1; C, maxilla 2; D, maxilliped; E, palp of maxilliped; F, gnathopod 1; G, palm and dactylus of gnathopod 1. Scale bars: A-E, G, 0.05 mm; F, 0.1 mm.

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  • Orchomenella rugosa sp. nov., holotype, male, 5.6 mm, NIBRIV0000806533. A, gnathopod 2; B, medial setation from carpus to dactylus; C, propodus and dactylus of gnathopod 2; D, pereopod 3; E, pereopod 4. Scale bars: A, B, 0.1 mm; C, 0.05 mm; D, E, 0.2 mm.

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  • Orchomenella rugosa sp. nov., holotype, male, 5.6 mm, NIBRIV0000806533. A, pereopod 5; B, pereopod 6; C, pereopod 7; D, pleon and urosome, lateral; E, uropod 1; F, uropod 2; G, uropod 3; H, telson. Scale bars: A-D, 0.2 mm; E-H, 0.1 mm.

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