Unobranchus abyssalis Hartman, 1965, is redescribed. The genus
Unobranchus is synonymised with
Terebellides. The genera of Trichobranchidae and possible evolutionary pathways within the family are discussed. Some comments are also given on the relationships of Trichobranchidae and other families of the order Terebellida. Keys are given to the genera of Trichobranchidae and the subfamilies of Terebellidae
sensu lato. [Proceedings of the 10th International Polychaete Conference (20-26 June 2010, Lecce, Italy) ]