|Medusa worms, Synaptula lamberti|
Members of this order have a circum-oral ring and tentacles, but do not have tube feet or radial canals. They are worm-like in form, adapted for burrowing through the sediment in a fashion similar to earthworms. The absence of tube feet gives the order its name, Apodida meaning without feet. They also lack the complex respiratory trees found in other sea cucumbers, and respire and excrete nitrogenous waste through their skin.
The ossicles, minute calcareous plates embedded in the skin and characteristic of each species, can include wheel and anchor shapes.
- Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. pp. 981–996. ISBN 0-03-056747-5.
- An illustrated key to the sea cucumbers of the South Atlantic Bight Retrieved 2012-02-12.
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