Revision of Kuwaita Mohammad, 1973 (Annelida, Polychaeta, Lumbrineridae)

The genus Kuwaita Mohammad, 1973 is redefined. Its diagnostic features are anterodorsal branchia in relation to parapodium, a well-developed nephridial papillae on posterior segments, three antennae in the nuchal fold, maxillary apparatus of labidognath type, with five plates, maxillae II shorter than maxillae I (about half the length of maxillae I), with broad sclerotized plates connecting the basal parts of both, mandibles free from each other along most of their length, and simple multidentate hooded hooks. Kuwaita, as redefined here, includes K. magna Mohammad, 1973 (the type species), Ninoe dolicognatha Rioja, 1941, Lumbriconereis heteropoda Marenzeller, 1879, Lumbrineris ?notocirrata sensu Gallardo 1968 (non Fauvel, 1932) and Lumbriconereis papillifera Fauvel, 1918. A key to all species is included.