Arbacioida

species of echinoderm

species of echinoderm

REDIRECT Arbacioida

thumb|upright=1|Test of an Arbacia lixula. Arbacia is a genus of sea urchins, widespread in the Atlantic and eastern Pacific oceans.

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.

Coelopleurus is an extant genus of echinoids with fossil records dating back to the Eocene, with remains found in Europe and North America.

species of echinoderm

species of echinoderm

species of echinoderm

species of echinoderm

species of echinoderm

species of echinoderm