Original diagnosis by McIntosh (1885: 188): "Body somewhat elongated. The four eyes almost in a transverse line. A single median and a lateral tentacle on each side. One pair of tentacular cirri. All these organs have enlarged bases and articulated tips. The biramous foot has the dorsal division represented by a single simple bristle. In the ventral branch the terminal pieces of the bristles are sabre-shaped with simple hooked tips."
McIntosh, William C. (1885). Report on the Annelida Polychaeta collected by H.M.S. Challenger during the years 1873-1876. Ser. Zoology. vol. 12 [part 34 of reports]: 1-554, plates 1-55, 1A-39A, & Annelida stations map. available online athttps://biodiversitylibrary.org/page/50688426