• Source: Arbacioida

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.
This order includes about 50 species (roughly 24 extant) divided into 14 genera:

Arbacia Gray, 1835
Arbaciella Mortensen, 1910
Arbia Cooke, 1948†
Baueria Noetling, 1885†
Codiopsis Agassiz, in Agassiz & Desor, 1846†
Coelopleurus Agassiz, 1840a
Cottaldia Desor, 1856 †
Dialithocidaris Agassiz, 1898
Habrocidaris Agassiz & Clark, 1907b
Hattopsis Ali, 1992†
Podocidaris Agassiz, 1869
Pygmaeocidaris Döderlein, 1905
Sexpyga Shigei, 1975
Tetrapygus Agassiz, 1841b




References


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.

Kata Kunci Pencarian:

• Landak laut
• Arbacioida
• List of echinoderm orders
• Echinacea (animal)
• Sea urchin
• Carinacea
• Hattopsis
• Canjuers Lagerstätte
• Euechinoidea
• Tafraout Group
• Arbacia