Cidaroida

Many different fossil Cidaroid radiola (MNHN).

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.

单词	Cidaroidea
释义	Cidaroidea 英语百科 Cidaroida 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.
随便看	Trinucleus trinune trinuride Trinway Trinxat trinz trio Trio A Trioaontophorus trioazole triobjective triobol triobolar triobolary triobols triocephalic monster triocephalus triocil triocresyl phosphate tri o cresyl phosphate tri o cresyl thiophosphate triocresyl thiophosphate trioctahedral trioctahedral arrangement trioctahedral clay mineral

Cidaroidea

Cidaroida