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Order of sea urchins From Wikipedia, the free encyclopedia
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.
| Arbacioida Temporal range: | |
|---|---|
| |
| Arbacia lixula | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Superorder: | Echinacea |
| Order: | Arbacioida Gregory, 1900 |
| Family: | Arbaciidae Gray, 1855 |
This order includes about 50 species (roughly 24 extant) divided into 14 genera:
 | This article about a sea urchin is a stub. You can help Wikipedia by expanding it. |
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