Family: Frontal cirri differ in size and/or pattern from ventral ones of files;
"collar" extends short distance along right edge of body; oral area not U-shaped
(Illustrated Guide, 1985).
Genus: With 2 or more right marginal files of cirri (Illustrated Guide, 1985).
Ellipsoid; flexible; posterior rounded;
flattened ventral surface with 4-10 rows of cirri; 2 marginal rows;
3 or more frontals; 5-12 anals (Kudo, 1966).
Ovoid to elongate with large number of ventral rows of cirri (files); transverse cirri present;
frontal cirri undifferentiated from ventrals
(Carey, 1992).
Species:
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