the type species of "lymnaea" is "lymnaea stagnalis" linnaeus, 1758; the type species of "stagnicola" jeffreys, 1830 is "stagnicola palustris" (= "lymnaea palustris"); and the type species of "omphiscola" rafinesque, 1819 is "omphiscola glabra". however, it is clear that these three species belong to the same clade (c2) and that "lymnaea" is not a monophyletic group. correa et al. (2010) proposed that species of clade c2 should all be called "lymnaea", according to the principle of priority of the international code of zoological nomenclature (iczn). by extension, "stagnicola" should not be used to name species in clade c1a since the type species belongs to clade c2. meier-brook & bargues (2002) suggested including "stagnicola emarginata", "stagnicola elodes", "stagnicola catascopium" and "lymnaea occulta" within a new genus "catascopia", while "stagnicla caperata" would belong to the genus "hinkleyia" baker, 1928. the phylogeny by correa et al. (2010) does not conflict with this nomenclature, although it would seem preferable to identify all species of clade c1a with the same name to reflect the close evolutionary relationships among these species. "hinkleyia" would be the preferable name according to the iczn. on the other hand, at least four genera names have been used for species of clade c1b: "lymnaea" lamarck, 1799; "galba" schrank, 1803; "fossaria" westerlund, 1885; and "bakerilymnaea". in the light of the present results, it would be preferable to unify nomenclature. according to the iczn, "lymnaea" should be the unified name, but given that the type species belongs to clade c2, "galba" could be a more appropriate name. finally, as said above, "austropeplea" cotton, 1942 is not a monophyletic group, and employing the genus "kutikina" ponder & waterhouse, 1997 (one species: "kutikina hispida") seems unjustified on the basis of the current phylogeny. this would also be consistent with results of puslednik et al. (2009). it would be preferable to use "bullastra" pfeiffer, 1839 for all species of clade c3a to fit the iczn.