Trochida

order of gastropods Trochida (Trochida) is an order comprising closely related families of organisms. It contains 6 families with 15 known species. This includes the family groups Calliostomatidae, Margaritidae, Phasianellidae, Tegulidae, Trochidae, and Turbinidae. Among its members, 1 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Gastropoda (Gastropoda).