“…In the latter, it was observed that polychaetes represent an important taxon in terms of number of species and abundance in shallow waters. This taxon is quite unknown (Wesenberg-Lund, 1962;Hartmann-Schröder, 1962,1965, although according to Rozbaczylo et al (1997) there are 182 species distributed in 10 orders, 35 families and 112 genera only in the area between 49ºS and 55º59 'S. In this paper we analyze the composition, species richness, abundance and the biogeographical affinities of the polychaete fauna from Aysen Fjord, Magellan Province (Moyano, 1982;Brattström and Johanssen, 1983). A comparison is made with some published data on the shallow, subtidal soft-bottom polychaete fauna from Antarctica (south of the Antarctic Convergence; ~60º S), and other sites of the Magellan Province (Dalcahue, 42º22'S, 73º39'W, Chiloé Island; Puerto Cisnes, 44º43'S, 72º42'W; and Magellan Straits).…”