Diadematoida

Diadematoida; Temporal range: Early Jurassic–Recent PreꞒ Ꞓ O S D C P T J K Pg N
	Diadema setosum
Scientific classification
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.

Taxonomy

According to ITIS :

family Aspidodiadematidae (Duncan, 1889)
family Diadematidae (Gray, 1855)
family Lissodiadematidae (Mortensen, 1903)
family Micropygidae (Duncan, 1889)

According to World Register of Marine Species :

family Diadematidae (Gray, 1855)

References

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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