Powelliphanta superba is a species of large, carnivorous land snail in the family Rhytididae, which is endemic to the South Island of New Zealand. Five subspecies are recognised, all of which are classified by the New Zealand Department of Conservation as being Nationally Endangered. Powelliphanta superba harveyi Powelliphanta superba mouatae Powelliphanta superba prouseorum Powelliphanta superba richardsoni Powelliphanta superba superba The eggs are oval and seldom constant in dimensions . See also List of non-marine molluscs of New Zealand References Powelliphanta Gastropods described in 1930 Gastropods of New Zealand Taxa named by Arthur William Baden Powell Endemic fauna of New Zealand Endemic molluscs of New Zealand