A New Species of Abyssal Opisthobranch Belonging to the Genus Bathydoris Bergh, 1884 (Opisthobranchia: Nudibranchia: Doridoidea) from Japan

Abstract

The abyssal nudibranch genus Bathydoris Bergh, 1884 is characterized by having very strong jaw-plates on both sides of the buccal mass and bearing independent clusters of gills (= branchial leaves) at the posterior end of the body. A new species Bathydoris japonensis, collected from the Japan Trench, is described and illustrated herein. Hitherto no species of this genus has been known from around Japan.