Syllidae (Polychaeta) from San Quintin lagoon, Baja California, Mexico, with the description of a new genus

During a recent study of the polychaetes from San Quintin lagoon (Baja Cali fornia) 514 specimens belonging to the family Syllidae (Polychaeta) were co llected, but only a few species were previously reported. In this paper, we report seven species: Syllis aciculata (Treadwell, 1945), Syllis gracilis (Grube, 1840), Syllis heterochaeta (Moore, 1909), Exogone (Exogone) lourei (Berkeley & Berkeley, 1938), Sphaerosyllis californiensis (Hartman, 1966), Grubeosyllis mediodentata, a new combination, and Cicese sphaerosylliformis , a new genus, and species. Grubeosyllis mediodentata is characterized by h aving cylindrical, somewhat elongated papilliform dorsal cirri, a long prov entriculus and pharynx, pharyngeal tooth located in front of the midline of the pharynx, and compound setae with long bidentate blades provided with l ong, fine spines on margin. The new genus Cicese is similar to the genus Sp haerosyllis since it has antennae, tentacular cirri and anal cirri with bul bous bases, as well as papillae on the palps and dorsum, but it has two pai rs of tentacular cirri instead of a single pair.