TAXONOMIC REEVALUATION OF GEMMULOBORSONIA SHUTO, 1989 (GASTROPODA: CONOIDEA), WITH A DESCRIPTION OF NEW RECENT DEEP-WATER SPECIES

The genus Gemmulobonorua Shuto, 1989, until now known only fromUpper Miocene-Lower Pleistocene deposits of the Tethys, is recordedin Recent faunas, with five new bathyal species from New Caledonia,Indonesia, Mozambique Channel, and the Philippines. Radularmorphology indicates that Gemmuloborsorua belongs to the subfamilyTurnnae, and not to Borsoruinae, where it had been allocatedbased on shell morphology. Columellar pleats, which have longbeen considered a synapomorphy of the borsornid group of genera,have thus been acquired independently in the Turnnae. The consequenceof this finding is that the current (sub)fanuly allocation ofsome genera, based on shell characters only, may need reevaluation. (Received 21 July 1995; accepted 8 August 1995)