Species of the Genus Kamaka (Crustacea: Amphipoda: Kamakidae) from Japan : Kamaka excavata sp. nov. and K. kuthae

Abstract

Two species of the genus Kamaka (Crustacea: Amphipoda: Kamakidae) are recorded and described from Japan. Kamaka excavata sp. nov. occurred in brackish waters of Tokushima, Shimane, Oita, Fukuoka, Kumamoto, and Miyazaki Prefectures. Male gnathopod 2 of this new species has a wide coxal plate, a long, acute process on article 6, and a posteriorly excavated article 7, and in these respects is dissimilar to those of other Kamaka species. Kamaka kuthae Dershavin, 1923 was collected from freshwater in Hokkaido and is fully redescribed herein. The present material agrees very closely with Dershavin's original description. A key to Japanese species of the genus is provided.