Recognition of Cenogenus Chamberlin, 1919 (Polychaeta: Lumbrineridae) based on type material

摘要

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 para-podia; 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.