A new species of the genus Benthonellania (Gastropoda, Rissooidea) from the Cape Verde archipelago

A new species collected in the Cape Verde Islands is described, assigned to the genus Benthonellania and compared with other species of that genus. Comments are made on the peculiar kind of zig-zag microsculpture found in the new species, and on its occurrence in other species of the family Rissoidae, reaching the conclusion that it is an evolutionary convergence among several groups in this family.