Brinkmann, 1917
Body anteriorly and posteriorly narrowed and barely flattened; mouth and proboscis pore united; rhynchocoel extends nearly full length of body, with walls containing a meshwork of interwoven circular, spiral and longitudinal muscle fibres; intestinal diverticula with both dorsal and ventral branches; mid-dorsal blood vessel almost full body length.
Protopelagonemertes hubrechti