Atelostomata

Atelostomata; Temporal range: Lower Jurassic–recent PreꞒ Ꞓ O S D C P T J K Pg N
	Echinocardium cordatum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Subclass:	Euechinoidea
Infraclass:	Irregularia
Superorder:	Atelostomata; von Zittel, 1879
Orders
	Holasteroida; Spatangoida

The Atelostomata are a type of sea urchins. They are distinguished from other sea urchins by their irregular shape and the absence of a feeding lantern. The group includes the well known heart urchins, as well as some less familiar and extinct forms.

List of orders

Family † Acrolusiidae Mintz, 1968
Family † Collyritidae d'Orbigny, 1853
Family † Disasteridae Gras, 1848
order Holasteroida (Durham & Melville, 1957)
order Spatangoida (L. Agassiz, 1840)
Family † Tithoniidae Mintz, 1968

References

Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.
Kroh A, Mooi R (eds.). "Atelostomata". World Echinoidea Database. World Register of Marine Species.

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