Diadematoida

Diadematoida Temporal range: Early Jurassic–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Diadema setosum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Superorder:	Diadematacia
Order:	Diadematoida Duncan, 1889
Families
(See Text)

The Diadematoida are an order of sea urchins. They are distinguished from other sea urchins by the fact that their spines are hollow, or at best have an open mesh at the core, and by the presence of 10 buccal plates around the mouth. Their tests can be either solid or flexible.

• Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 980. ISBN 0-03-056747-5.
• National History Museum. "Diadematoida". Retrieved 20 Dec 2009.

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