A NEW SPECIES IN THE ANTARCTIC GENUS TORETOCHEILUM (BRYOZOA, CHEILOSTOMATIDA)

The Antarctic species Toretocheilum absidatum Rogick, 1960, is redescr ibed, and distinguished from a new species of the genus; both are illu strated using scanning electron microscopy. Toretocheilum species deve lop unilaminar patches of thickly calcified autozooids, with cryptocys tidean frontal shields bordered by frontal septula. The primary orific e bears a small sinus emphasized by massive condyles overlain by front al cusps. Toretocheilum absidatum has rugose calcification and large a dventitious avicularia; T. turbinatum is smoothly calcified, lacks avi cularia and bears a massive suboral umbo.