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- Cidaroida, also known as pencil urchins, 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.en.wikipedia.org/wiki/Cidaroida
Cidaroidea (onderklasse) - Wikipedia
Cidaroida - Wikipedia
Cidaroida - Wikipedia
Cidaridae - Wikipedia
Cidaris cidaris - Wikipedia
Categorie:Cidaroidea - Wikipedia
Cidaridae - Wikipedia
Category:Cidaroida - Wikipedia
Cidaroida - Wikispecies - Wikimedia