Gnathia gurjanovae sp. n., a new species of Gnathiids (Isopoda: Gnathiidae) from Peter the Great Bay, Sea of Japan

A new species of isopods of the suborder Gnathiidae, Gnathia gurjanovae sp. n. has been described from Peter the Great Bay, Sea of Japan. The new species is most similar to G. derzhavini Gurjanova, 1933, but differs from the latter in a series of morphological characteristics of the male: frontal margin of the head bears a well-pronounced mediofrontal process; each mandible has an unarmed carina and an obscure tooth; pereopod 6 is relatively smooth; the basis, ischium, and merus of pereopod 4 bear strong spurlike processes.