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