Synallactida

order of echinoderms Synallactida (Synallactida) is an order comprising closely related families of organisms. It contains 2 families with 12 known species. This includes the family groups Stichopodidae, and Synallactidae. Among its members, 3 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Holothuroidea (Holothuroidea).