Species of Antarctoscyphus Pena Cantero, Garcia Carrascosa and Vervoort, 1997 (Cnidaria, Hydrozoa, Sertulariidae) from recent Antarctic expeditions with RV Polarstern, with the description of two new species

Six species of the genus Antarctoscyphus Pena Cantero, Garcia Carrascosa an d Vervoort, have been studied, two of which are new to science (Antarctoscy phus admirabilis sp. nov, and A. fragilis sp. nov.). The material studied o riginates from the Weddell Sea and was collected by several French and Germ an Antarctic expeditions with the R.V. Polarstern. Each species is describe d and figured, the systematic position amongst allied species discussed and available data concerning autecology and geographical distribution given. The type material of two badly known species, A. grandis (Blanco) and A. gr uzovi (Stepan'yants), has been re-examined, re-described and figured. A com parative table listing main features of known species of Antarctoscyphus is presented. Finally, a general survey of biogeographical distribution of th e known species is given.