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Sea-cucumbers with tube-feet and tree-shaped tentacles; tentacle ampullae absent or small. The retractor muscles are usually present. Respiratory trees are present, sometimes connected with the alimentary canal through a rete mirabile. The stone canal hanging free in the body cavity. The mesentery of the posterior intestinal loop in the left or right ventral interradius. The gonads are on both sides of the dorsal mesentery. Usually no Cuvierian organs. Deposits usually more or less irregular, fenestrated plates, sometimes tables.

Treated taxa:
- Family Cucumariidae
- Family Phyllophoridae
- Family Psolidae

Order Dendrochirota