Arbacioida
Encyclopedia
The Arbacioida are an order
of sea urchin
s, 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 test are of similar size. It contains the following genera:
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...
of sea urchin
Sea urchin
Sea urchins or urchins are small, spiny, globular animals which, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum. They inhabit all oceans. Their shell, or "test", is round and spiny, typically from across. Common colors include black and dull...
s, 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
Salenioida
The Salenioida are an order of sea urchins, containing a single family, the Saleniidae.They are distinguished from other sea urchins by the presence of a large plate on the upper surface, with the anus to one side. They have very large tubercles between the ambulacral plates, and much smaller ones...
, all of the tubercles on their test are of similar size. It contains the following genera:
- ArbaciaArbaciaArbacia is a genus of sea urchins.Arbaciaby Dave Grant"Sometimes you see queer things...spiny sea urchins, for instance…in aslow motion parade...
Gray, 1835 - Arbaciella Mortensen, 1910a
- Arbia Cooke, 1948†
- Baueria Noetling, 1885†
- Codiopsis L. Agassiz, in Agassiz & Desor, 1846†
- CoelopleurusCoelopleurusCoelopleurus is a genus of echinoid. Fossil records date back to the Eocene, with remains found in Europe and North America.-Species:* Coelopleurus australis H.L. Clark, 1916* Coelopleurus exquisitus Coppard & Schultz, 2006...
L. Agassiz, 1840a - Cottaldia Desor, 1856 †
- Dialithocidaris A. Agassiz, 1898
- Habrocidaris A. Agassiz & Clark, 1907b
- Podocidaris A. Agassiz, 1869
- Pygmaeocidaris Döderlein, 1905
- Sexpyga Shigei, 1975
- Tetrapygus L. Agassiz, 1841b