Two new species of the genus Anonyx (amphipoda: gammaridea: lysianassoidea) from Onagawa Bay, northeastern Japan

Abstract

Two new species of lysianassoid amphipods, Anonyx omorii sp. nov. and A. abei sp. nov. were described from shallow waters of Onagawa Bay, northeastern Japan. The genus Anonyx has been divided into five informal groups by the morphological characters of the uropod 2 (Steele, 1979). According to the morphological features of uropod 2, A. omorii sp. nov. is assigned to A. compactus group with the inner ramus of uropod 2 completely constricted beyond the insertion point of a long distal spine, and A. abei sp. nov. to A. nugax group with the inner ramus of uropod 2 constricted at the insertion point of the long distal spine.