Valvatida

order of echinoderms Valvatida (Valvatida) is an order comprising closely related families of organisms. It contains 7 families with 8 known species. Key family groups include Acanthasteridae, Anseropodidae, Asterinidae, Goniasteridae, Ophidiasteridae, and Poraniidae. Among its members, 1 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Sea Stars (Asteroidea).