Cycloneritida

order of gastropods Cycloneritida (Cycloneritida) is an order comprising closely related families of organisms. It contains 2 families with 10 known species. This includes the family groups Neritidae, and Phenacolepadidae. Among its members, 3 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Gastropoda (Gastropoda).