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Holothuroidea

A Dictionary of Zoology | 1999 | Copyright

Holothuroidea (sea cucumbers; phylum Echinodermata, subphylum Echinozoa) A class of worm-like echinoderms which may be free-living or attached. The mouth, surrounded by variably branched tentacles, is at one end of the elongate body, the anus at the other. The calcitic skeleton is not rigid, being reduced to small sclerites (or spicules) of very variable shape: hooks, anchors, rings, and plates. Fossil spicules of sea cucumbers are first encountered in rocks of Ordovician age.

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MICHAEL ALLABY. "Holothuroidea." A Dictionary of Zoology. 1999. Encyclopedia.com. 10 Feb. 2010 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Holothuroidea." A Dictionary of Zoology. 1999. Encyclopedia.com. (February 10, 2010). http://www.encyclopedia.com/doc/1O8-Holothuroidea.html

MICHAEL ALLABY. "Holothuroidea." A Dictionary of Zoology. 1999. Retrieved February 10, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Holothuroidea.html

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