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Characteristics, distribution and ecology
Taxonomische classification
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Description
Sea-cucumbers with tube-feet entirely absent, even the radial water-vessels are usually undeveloped. The tentacles are feather-shaped or with only few side branches, more rarely simply digitate. The retractor muscles are usually absent.
There are no tentacles ampullae and no respiratory trees.

Treated taxon:
- Family Synaptidae

Order Apoda