The genus Nauphanta, described to contain the species novaeaehollandiae (as novae Hollandiae) and corallina, is now considered a synonym of Marphysa. Examination of the types has demonstrated that the two species do not belong to the same genus. Nauphanta novaehollandiae has simple, capillary setae and series of large, flat, thin fan-shaped setae arranged in a row on the anterior face of far posterior parapodia and lacks compound setae. Nauphanta corallina is a member of Marphysa in that it has compound falcigers in addition to simple setae and has true pectinate setae mixed with the limbate setae in the dorsal fascile. Nauphanta is here defined in relation to Marphysa. Eunice mossambica Peters, 1854, is newly referred to Nauphanta.