Ray muni da Macpherson & Machordom, 2000 (Crustacea: Decapoda: Anomura: Munididae) from the KUMEJIMA 2009 Expedition in the Ryukyu Islands, Japan

摘要

Two species of the munidid genus Raymunida Macpherson & Machordom, 2000, are reported from Kume Island, Ryukyu Islands, southwestern Japan. Raymunida striata n. sp. appears closest to R. confundens Macpherson & Machordom, 2001, and R. dextralis Macpherson & Machordom, 2001, but is distinguished by the second and third abdominal somites each with an uninterrupted stria between two distinct transverse ridges on the dorsal surface, the merus of the third maxilliped with a prominent distal spine on the extensor margin, and the mero-earpal articulation of the fourth pereopod reaching only to the lateral end of the anterior cervical groove of the carapace. The occurrence of R. vittata Macpherson, 2009, in Kume Island greatly extends its distribution rangeto the north hemisphere. Morphological variations of R. vittata are also discussed on the basis of the present specimens. An updated key to the species of Raymunida is provided.