抄録
Abstract: The first record of an entocytherid ostracod from Japan is reported. Uncinocythere occidentalis(Kozloff and Whitman, 1954)was found living commensally on the crayfish Pacifastacus leniusculus trowbridgii in Hokkaido, Japan. This is also the first record of U. occidentalis outside the western United States and it is postulated that it is an invasive species in Japan, unwittingly imported with this North American crayfish.
