Back سيدارويدا ARZ Cidaroides Catalan Cidaroida CEB Cidaroida Spanish Cidaroida French Cidaroida Hungarian Cidaroida Italian Cidaroida Dutch Cidaroida Portuguese Cidaroida Turkish
| Cidaroida Temporal range:
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| Cidaris cidaris | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Subclass: | Perischoechinoidea |
| Order: | Cidaroida Claus, 1880 |
| Families | |
Cidaroida,[1] also known as pencil urchins,[2] 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.
- ^ Cite error: The named reference
WoRMSwas invoked but never defined (see the help page). - ^ 250 Million Years of Bindin Evolution