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Arbacioida

From Wikipedia, the free encyclopedia

Arbacioida
Temporal range: Middle Jurassic–recent
Arbacia lixula
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Superorder: Echinacea
Order: Arbacioida
Gregory, 1900
Family: Arbaciidae
Gray, 1855

Arbacioida are an order of sea urchins, consisting of a single extant 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.

Genera:

References

[edit]
  • 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.