Suborder Ophiomusina O’Hara et al., 2017

Diagnosis

Dental plate entire, sockets shallow, single row of teeth. Tentacle openings minute within-plate perforations of the lateral arm plate, except on proximal arm joints. Lateral arm plates conspicuously thick and meeting dorsally and ventrally. Genital papillae restricted to ventral side. Second tentacle pore concealed inside mouth slit.