Genus Pectinaria Lamarck, 1818

Type-species. Nereis cylindraria belgica Pallas, 1766, designated by Hartman (1959).

Diagnosis. Cephalic veil completely free from operculum. Rim of cephalic veil with numerous long cirri. Dorsal and lateral margin of semicircular operculum smooth. Ventral margin of operculum with numerous notopodial paleae on each side. Comb-like branchiae present on segments 3 – 4. Notopodia other than those of segment 1, which bear paleae, on segments 5 – 21 (17 pairs). Neuropodia, 13 pairs on segments 8 – 20 with transverse tori, with row of uncini. Uncini with more than one longitudinal rows of major teeth. Scaphe flattened dorsally with anal flap and distinctly separate from posterior segments.