title: Description of a new species of Calliostoma (Gastropoda, Calliostomatidae) from Southeastern Brazil.
abstract: Calliostoma tupinamba isa new species from Southeastern Brazil, ranging from southern Rio de Janeiro to northern São Paulo, and found only on coastal islands, on rocks and sessile invertebrates at 3 to 5 meters of depth. Shell and soft part morphology is described here in detail. Calliostoma tupinamba is mainly characterized by a depressed trochoid shell; eight slightly convex whorls; a sharply suprasutural carina starting on the third whorl and forming a peripheral rounded keel; and a whitish, funnel-shaped and deep umbilicus, measuring about 5%-10% of maximum shell width. Calliostoma tupinamba resembles Calliostoma bullisi Clench & Turner, 1960 in shape, but differs from it in being taller and wider, having a smaller umbilicus and lacking a strong and large innermost spiral cord at its base. Finally, an identification key of Brazilian Calliostoma species is presented.
authors.affiliation: Museu de Zoologia da Universidade de São Paulo, Cx. Postal 42494; 04299-970, São Paulo, SP, Brazil.
authors.forename: Ana Paula S
authors.initials: AP
authors.lastname: Dornellas
keywords: Anatomy; Calliostoma tupinamba; coastal island; new species; taxonomy