The nudibranch mollusc Corambe batava Kerbert, 1886, was at that time considered to be endemic to the brackish Zuiderzee in The Netherlands. It has recently been observed in France and is apparently an immigrant originating from the east coast of North America. The species is found conspecific with C. obscura (Verrill, 1870), which name has priority. It is one of the many successful immigrants which have a preference for brackish habitats. The original description of the type-species C. sar-gassicola Bergh, 1871 of the genus Corambe Bergh, 1869 is not entirely clear and this has confused the taxonomy of the genera. We re-examined the type specimen which appeared to have no natural notch in. notum and foot, thus the described incisions should be considered as artefacts. Therefore, Corambe is the same as Doridella Verrill, 1870. Based on three distinguishing characteristics in all described Corambidae, this family falls into three genera: Corambe Bergh, 1869 (including Doridella Verrill, 1870, and p.p. Corambella Balch, 1899), Neocorambe nov. gen. (including p.p. Corambe ), and Paracorambe nov. gen. (including p.p. Corambella ).