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Characteristics, distribution and ecology
Taxonomische classification
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Free-living Echinoderms usually with an elongated, worm- or sausage-shaped body.

Mouth and alimentary canal
They have no free arms, but a circle of tentacles around the mouth. The mouth is located at the anterior end of the body. The oesophagus is surrounded by a calcareous ring. The alimentary canal is long and mostly looped. The anus is usually at the posterior end.

The skeleton generally consists of calcareous deposits (spicules). The tube-feet (if present) are never in a furrow.

Treated taxa:
- Order Apoda
- Order Dendrochirota

Sea-cucumbers (Class Holothurioidea)