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 n 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.
