The subfamily Exogoninae was studied from samples collected in shallow waters of the fjords and channels of the Patagonian region of Chile. Two new species are described: Exogone yagan n. sp. and Erinaceusyllis carrascoi n. sp. The species Exogone heterosetoides, Erinaceusyllis bidentata and Erinaceusyllis perspicax are newly reported to Chile, as well as the genus Erinaceusyllis San Martín, 2005. Parapionosyllis brevicirra, Sphaerosyllis hirsuta and Salvatoria rhopalophora, n. comb., are also reported, with the latter redescribed. Finally, we redescribe Exogone anomalochaeta from Antarctica. Most of the species were found inside tubes of Chaetopterus cf. variopedatus; this habitat is new for Exogoninae. This research is a new taxonomic account of Syllidae in Chile and improves the knowledge of Exogoninae of the Patagonian region.
Keywords: Annelida, Exogoninae, Syllidae, Annelida, Patagonia, Chile, taxonomy.