Animalia > Echinodermata > Echinoidea > Cidaroida

Cidaroida (pencil urchins)

Wikipedia Abstract

Cidaroida is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea. All other orders of this subclass, which were even more primitive than the living forms, became extinct during the Mesozoic.
View Wikipedia Record: Cidaroida


Cidaroidea (136)
Histocidaroidea (17)

(...) = Species count
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External References


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