Echinocystitoida
Echinocystitoida were an order of extinct sea urchin in the subclass Perischoechinoidea.
Echinocystitoida | |
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Scientific classification | |
Kingdom: | Animalia |
Phylum: | Echinodermata |
Class: | Echinoidea |
Subclass: | Perischoechinoidea |
Order: | †Echinocystitoida |
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