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- ›sea urchins and sea cucumbers
- ›Sea Urchins, Sand Dollars, and Heart Urchins
- ›sea urchins
- ›Carinacea
- ›Echinacea
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:
1 branches of this order, most-observed first
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Where it lives
Recorded sightings
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geo-referenced records in GBIF, from museums, herbaria and field observers.
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In the stacks
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Every page naming Arbacioida in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 120867.