Gammarus species from River Jumahe, China (Crustacea, Amphipoda, Gammaridae)

Abstract

Three Gammarus species are reported from River Jumahe. Gammarus madidus sp. n. is characterized by antenna 2 with groups of long setae along the anterior and posterior margins, inner ramus of uropod 3 reaching about 40% of length of outer ramus and both rami fringed with long simple setae. G. lacustris Sars, 1863 is distinguished by epimeral plates 2 and 3 with sharp posterodistal comers, inner ramus of uropod 3 reaching about 75% of length of outer ramus and both rami armed with plumose setae. G. nekkensis Uchida, 1935 differs from congeneric species by pereopod 3 with long curled setae on the posterior margin and inner ramus of uropod 3 reaching 50% of outer ramus. Distribution data of these gammarids are presented.