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Itocyclops, a New Genus Proposed for Speocyclops Yezoensis (Copepoda: Cyclopoida: Cyclopidae)

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image of Journal of Crustacean Biology

Abstract We redescribe Speocyclops yezoensis Ito on the basis of specimens from Japan and from Alaska and Tennessee, U.S.A. The combination of the segmentation of the swimming legs; the lack of dimorphism in the structure of the swimming legs, except for the modified terminal spine of the leg 3 endopodite in the males of some populations; the partly fused proximal segment of leg 5; and, in the female, the peculiar structure of the seminal receptacle provide grounds to propose a new genus Itocyclops to accommodate this taxon. A new record from Tennessee is the first from the eastern U.S.A.

Affiliations: 1: a Department of Invertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, District of Columbia 20560-0163, U.S.A. (corresponding author ; 2: b 372 Irifunecho, Yoichimachi, Hokkaido 046-0111, Japan


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