Two New Records of Anisogammarid Amphipods (Crustacea: Amphipoda: Gammaridea) from Japan

Abstract

Barrowgammarus macginitiei (Shoemaker, 1955) and Spasskogammarus spasskii (Bulycheva, 1952) are reported based on specimens from Hokkaido, northern Japan. These are the first records of these two genera in Japan. The single specimen referred to B. macginitiei differs from the original description in having a relatively short antenna 1, distally tapering coxa 1, long setae on the merus and carpus of pereopods 3 and 4, long, slender setae on the ventral margins of epimeral plates 2 and 3, marginal setae on the rami of uropods 1 and 2, a small protuberance on urosomite 3, and a single accessory lobe on the coxal gill of pereopod 6. The Japanese specimens of S. spasskii generally agree with the original description except for the presence of a few slender setae on the inner margin of the outer ramus of uropod 3.