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The Arbacioida are an order of sea urchins, consisting of a single family, the Arbaciidae. They are distinguished from other sea urchins by the presence of five separate plates around the anus. Unlike their close relatives, the Salenioida, all of the tubercles on their tests are of similar size. It contains these genera:

Arbacioida
Temporal range: Middle Jurassic–recent
Scientific classification
Kingdom:
Phylum:
Class:
Superorder:
Order:
Arbacioida

Gregory, 1900
Family:
Arbaciidae

Gray, 1855

ReferencesEdit

  • Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 980. ISBN 0-03-056747-5.
  • National History Museum. "Arbacioida". Retrieved 19 Dec 2009.