Cenogenus Chamberlin with
C. descendens Chamberlin as its only species has been considered a junior synonym of
Lumbrineris. It is here redescribed and emended as a distinct genus. Its diagnostic features include a single antenna in the nuchal fold; single digitate branchiae on anterior parapodia; maxillary apparatus of labidognath type, with four plates, maxillae III and IV edentate, maxillae V absent; mandible partially fused and simple multidentate hooded hooks.
Paraninoe Levenstein (type species
Ninoe fusca Moore) is a junior synonym of
Cenogenus; both species,
C. descendens and
C. fusca are recognized based on type material.
