Prostomium rounded or truncate with 4 small frontal antennae. No jaws although proboscis tends to be papillate. First 3 setigers uniramous remainder biramous with conical dorsal and ventral cirri. Notosetae capillaries, neurosetae compound spinigers.
(after Day 1967 and Ushakov 1974 Polychaetes of the sub-order Phyllodociformia of the polar basin and northwestern part of the Pacific. Fauna of the USSR no.102)