A New Abdominally Parasitizing Bopyrid, Anisarthrus okunoi sp. nov. (Crustacea: Isopoda), Infesting the Hinge-Beak Shrimp Rhynchocinetes uritai Kubo, 1942 (Crustacea: Decapoda: Rhynchocinetidae)

Abstract

Anisarthrus okunoi sp. nov., an abdominal parasite of the hinge-beak shrimp Rhynchocinetes uritai Kubo, 1942, is described from Awaji Island, central Japan. The new bopyrid, the second species of Anisarthrus, is distinguished from A. pelseneeri Giard, 1907 from Boulogne, France, by the lateral plates of the concave side being smaller than those of the convex side, the large, lanceolate pleopods 1–2 and slightly bilobed pleopods 3–4, the simple, bulbous pleotelson in the female, the lack of eyes, and the rounded posterior margin of the pleotelson in the male. This is the first record of bopyrid infestation of any member of the family Rhynchocinetidae in the world.