Belongs within: Gastropoda.Contains: Viviparinae. The Viviparoidea are an entirely freshwater group of snails including the living Viviparidae and the tentatively assigned Late Jurassic to Pliocene Pliopholygidae. Members of this group have thick, globose shells, often with a spiral banding pattern. Viviparidae feed via muco-ciliary filtering, as did at least some Pliopholygidae (Gray 1988). Water is… Continue reading Viviparoidea