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Alatajassa (Amphipoda, Corophiidea), A New Genus from the Pacific Coast of North America

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[Alatajassa, a new genus of ischyrocerin corophiidean amphipod comprising two species has been discovered on the coast of Pacific North America. Alatajassa similis n. sp. has been found from California to Alaska (41°N 124°W-56°N 134°W) and Alatajassa diversa n. sp. from Amchitka Island, Alaska (51°N 179°E). Alatajassa is so named because of the wing-like expansions on the ischium of gnathopods 1-2 and pereopods 5-7. The genus is unusual in the Ischyrocerini in having long spinous processes extending ventrally from the peduncles of uropods 1 and 2, a stout, uniramous uropod 3, and sexual dimorphism posteriorly rather than anteriorly. Alatajassa, un nouveau genre d'amphipodes Corophiidae Ischyrocerinae comprenant deux espèces a été découvert sur la côte Pacifique de l'Amérique du Nord. Alatajassa similis n. sp. a été trouvée de la Californie à l'Alaska (41°N 124°W-56°N 134°W) et Alatajassa diversa n. sp. de l'île Amchitka, Alaska (51°N 179°E). Alatajassa est nommée ainsi d'après les expansions aliformes présentes sur l'ischion des gnathopodes 1-2 et des péréiopodes 5-7. Le genre est inhabituel chez les Ischyrocerini par la présence de longs processus épineux s'étendant ventralement des pédoncules des uropodes 1 et 2, d'un uropode 3 fort et uniramé, et d'un dimorphisme sexuel visible postérieurement plutôt qu'antérieurement., Alatajassa, a new genus of ischyrocerin corophiidean amphipod comprising two species has been discovered on the coast of Pacific North America. Alatajassa similis n. sp. has been found from California to Alaska (41°N 124°W-56°N 134°W) and Alatajassa diversa n. sp. from Amchitka Island, Alaska (51°N 179°E). Alatajassa is so named because of the wing-like expansions on the ischium of gnathopods 1-2 and pereopods 5-7. The genus is unusual in the Ischyrocerini in having long spinous processes extending ventrally from the peduncles of uropods 1 and 2, a stout, uniramous uropod 3, and sexual dimorphism posteriorly rather than anteriorly. Alatajassa, un nouveau genre d'amphipodes Corophiidae Ischyrocerinae comprenant deux espèces a été découvert sur la côte Pacifique de l'Amérique du Nord. Alatajassa similis n. sp. a été trouvée de la Californie à l'Alaska (41°N 124°W-56°N 134°W) et Alatajassa diversa n. sp. de l'île Amchitka, Alaska (51°N 179°E). Alatajassa est nommée ainsi d'après les expansions aliformes présentes sur l'ischion des gnathopodes 1-2 et des péréiopodes 5-7. Le genre est inhabituel chez les Ischyrocerini par la présence de longs processus épineux s'étendant ventralement des pédoncules des uropodes 1 et 2, d'un uropode 3 fort et uniramé, et d'un dimorphisme sexuel visible postérieurement plutôt qu'antérieurement.]

Affiliations: 1: Canadian Museum of Nature, P.O. Box 3443, Station D, Ottawa, Ontario K1P 6P4, Canada;, Email: kconlan@mus-nature.ca

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/content/journals/10.1163/156854007782605574
2007-11-01
2017-08-16

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