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Salenioida

The Salenioida are an order of sea urchins.

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 ==
Taxonomy
According to World Register of Marine Species : • family Saleniidae L. Agassiz, 1838 • family Acrosaleniidae Gregory, 1900 • family Goniophoridae Smith & Wright, 1990 • family Hyposaleniidae Mortensen, 1934 • family Pseudosaleniidae Vadet, 1999b ==References==
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