Cidaroida

Cidaroida
Temporal range: Lower Permian–Recent
Cidaris cidaris
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Subclass: Perischoechinoidea
Order: Cidaroida
Claus, 1880
Families

See text

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.

  1. ^ Cite error: The named reference WoRMS was invoked but never defined (see the help page).
  2. ^ 250 Million Years of Bindin Evolution