Littorinimorpha

order of gastropods Littorinimorpha (Littorinimorpha) is an order comprising closely related families of organisms. It contains 29 families with 80 known species. Key family groups include Amnicolidae, Aporrhaidae, Assimineidae, Bithyniidae, Bythinellidae, and Calyptraeidae. Among its members, 10 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Gastropoda (Gastropoda).