The Salenioida are an order of

sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of ...

Description and characteristics

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 on the ambulacral plates themselves.

Taxonomy

According to

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ...

: * family Saleniidae L. Agassiz, 1838 * family Acrosaleniidae Gregory, 1900 † * family Goniophoridae Smith & Wright, 1990 † * family Hyposaleniidae Mortensen, 1934 † * family Pseudosaleniidae Vadet, 1999b †

References

* * Echinacea (animals) Echinoderm orders Extant Middle Jurassic first appearances {{echinoidea-stub