Two New Shallow-water Species of Agathotanais (Crustacea: Tanaidacea) from Japan

Abstract

We describe two shallow-water species of Agathotanais, A. misakiensis sp. nov. and A. toyoshioae sp. nov., from Japan. Agathotanais misakiensis was collected from 211-493m depth in the Sagami Sea, North Pacific Ocean. It closely resembles A. ghilarovi Kudinova-Pasternak, 1989, but differs in having shorter pereonites 3 and 4, all pleonites narrower than pereonite 6, and a shorter article 3 in the antennule. Agathotanais toyoshioae, collected from 95m depth in the Genkai Sea, Sea of Japan, is very similar to A. spinipoda Larsen, 1999. The former can be distinguished from the latter by its narrower pleonites, the presence of a ventral keel on pleonites 1 and 2, and the presence on the basis and absence on the carpus and propodus of small spines on pereopods 4-6.