Holothuroidea

class of echinoderms Holothuroidea (Holothuroidea) is a class of organisms united by key anatomical and physiological traits. It contains 4 orders with 38 known species. This includes the order groups Dendrochirotida, Holothuriida, Persiculida, and Synallactida. Among its members, 8 species are currently classified as threatened (Critically Endangered, Endangered, or Vulnerable). It belongs to Echinoderms (Echinodermata).