Prostomium frontally broadly rounded. Peristomium two rings. Antennae and palps absent. Nuchal organs present. First segement similar in size to next, with small parapodia. All notopodia with internal aciculae; neuropodia well-developed, distally truncate. Dorsal and ventral cirri present. Ventral cirri especially distinct in anterior chaetigers. Gills parapodial. Epidermal papillae absent. Paired pygidial cirri present. Stomodaeum a thickened eversible ventral structure supporting heavily sclerotinized jaws. A pair of mandibles and several pairs of maxillae present; poorly sclerotinized, paddle-shaped maxillary carriers loosely attached to posterior end of maxilla I in a prionognath arrangement. Compound spinigers and capillary chaetae present. Joints of compound chaetae with double ligaments; appendages with slender tips.
The above description is taken from Fauchald & Rouse (1997).
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