Studies on West Indian Marine Molluscs, 1. Risomurex mosquitensis, a new Caribbean species, with remarks on the status of the genus Risomurex (Gastropoda: Muricidae)

After studying the holotype of Engina schrammi Crosse, 1863, it became evident that the genus Risomurex Olsson & McGinty, 1958, is based on misidentified shells. Material recently collected at the Caribbean coast of Costa Rica included a new species, Risomurex mosquitensis, which is prefered to be considered the type-species of Risomurex. Relations with congeneric species are discussed. St. Thomas is designated type-locality for Ricinula rosea Reeve, 1846.