Genus Sabellaria Lamarck, 1812

Diagnosis. Three parathoracic segments. Opercular crown and stalk completely divided at anterior midline into two symmetrical lobes. Opercular paleae on each lobe arranged in 3 rows made of three or four kinds of paleae. Outer and inner row of paleae of a single kind, and middle row of paleae made either of a single kind of paleae or of two kinds of paleae, long and short. Nuchal spines present or absent. Dorsal branchiae present in parathoracic and abdominal segments.