New species of the genus Isoschizoporella (Bryozoa: Gymnolaemata: Cheilostomatida: Eminooeciidae) from the Weddell Sea

Abstract. A new species, Isoschizoporela marisweddelli sp. nov., from the bryozoan order Cheilostomatida was described within the genus endemic for Antarctic waters. Fragments of colonies of the species were found in the Weddell Sea by the German Antarctic Expedition ANT XIII/3 on the research vessel “Polarstern” in 1996. The species is distinguished from the other species of Isoschizoporella by the incrusting colony, elongate, hexagonal and convex autozooids, semicircular primary orifice with shallow sinus, strongly convex avicularian chamber, avicularium with semicircular mandible, and additional avicularium on frontal surface of autozooid. The species belongs to the infraorder Ascophora, superfamily Schizoporelloidea.