Echinoida is an order of sea urchins in the class Echinoidea. They are distinguished from other sea urchins by simultaneously possessing both an un-sculpted test and a feeding lantern with large plates fused across the top of each pyramid.
Taxonomy
Order Echinoida
family Echinidae Gray, 1825
family Echinometridae Gray, 1825
family Parasaleniidae
family Strongylocentrotidae Gregory, 1900
See also
Colobocentrotus atratus - Shingle urchin
Echinus acutus - White sea urchin
Echinus esculentus - Common sea urchin
Echinus tylodes
Evechinus chloroticus - New Zealand sea urchin
Heterocentrotus mammillatus - Red pencil urchin
Heterocentrotus trigonarius - Slate pencil urchin
Loxechinus albus - Chilean sea urchin
References
Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5.
National History Museum. "Echinoida". Retrieved 19 Dec 2009.