Nomenclature, redescription, and new record from Okinawa of Cymbasoma morii Sekiguchi, 1982 (Monstrilloida)

Abstract

Haemocera morii Tokioka, 1949 was undiagnosed and thus unavailable. Sekiguchi’s description in 1982 of a second female, as Cymbasoma morii,inadvertently validated the species name. Both specimens, from bays in Honshu, Japan, are deemed to be syntypes; Tokioka’s is lost but Sekiguchi’s is designated the lectotype and redescribed. Several more females collected over a fringing reef at Sesoko Island, Okinawa, are also described. Previously overlooked features include: cephalic ornamentation, thoracic sensilla, precise antennular setation, a short medial seta on the exopod of leg 5, dorsal wrinkles on the genital segment, and swollen tips of the genital spines. Cymbasoma morii is distinguished from five similar species by various combinations of characters; however, it sufficiently resembles C. longispinosum (Bourne) that subspecific rank might be warranted. A literature record of C. longispinosum from Kerala, India, possibly represents misidentified C. morii.