The Polychaeta “Sedentaria” collected in Terra Nova Bay (Ross Sea) during the Second Italian Oceanographic Antarctic Expedition (1989–90) have been studied. A total of 1518 specimens have been examined and 43 species, belonging to 14 families, have been identified. A new species of Oweniidae, Myriochele antarctica and a new subspecies of Spionidae, Scolelepis eltaninae nudipalpa are described. Terebellidae was the most important family in number of species, Spionidae, Oweniidae and Orbiniidae in number of individuals. More than 60% of the species are endemic to Antarctic and sub-Antarctic areas.
