Deep-water Calliostomatidae (Vetigastropoda, Gastropoda) from the South Azorean Seamount Chain

Seven species of the family Calliostomatidae collected on the South Azorean Seamount Chain (SASC) have been studied. Two species, probably restricted to bathyal crests and slopes of the SASC, are described as new: Calliostoma freiwaldi n. sp. and Calliostoma cyrtoida n. sp. Two uncommon species were found as empty shells: Calliostoma grimaldii Dautzenberg & H. Fischer, 1896 and Calliostoma normani (Dautzenberg & H. Fischer, 1897). Calliostoma heugteni Vilvens & Swinnen, 2003 is common on the SASC. Calliostoma maurolici (G. Seguenza, 1876) and Calliostoma leptophyma Dautzenberg & H. Fischer, 1896, which are common in cold-water coral habitats in the NE Atlantic including the SASC, were also collected