Freshwater copepods from the east coast of the Kamchatka Peninsula, Russia

Detritus samples collected from freshwaters of the east coast of the Kamchatka Peninsula yielded 10 species of cyclopoid and 7 species of harpacticoid copepods, as follows: Macrocyclops albidus, Eucyclops serrulatus, E. speratus, Cyclops scutifer, Megacyclops viridis, Acanthocyclops vernalis, A. robustus, Diacyclops bicuspidatus, and Mesocyclops leuckarti; Attheyella nordenskjoldi, Maraenobiotus brucei, Epactophanes richardi, Moraria duthiei, Bryocamptus hiemalis, B. calvus, and B. umiatensis. Morphological variations of specimens from Alaskan and Japanese populations were examined. Elongation of the caudal rami of Eucyclops speratus and Diacyclops bicuspidatus, and fusion of the antennular articles of the latter species are noticeable.