Atelostomata
| Atelostomata Temporal range: Lower Jurassic–recent |
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| Echinocardium cordatum | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Superorder: |
Atelostomata von Zittel, 1879 |
| Orders | |
Cassiduloida
Holasteroida
Spatangoida
The Atelostomata are a superorder of sea urchins. They are distinguished from other sea urchins by their irregular shape and the absence of a feeding lantern. The group includes the well known heart urchins, as well as some less familiar and extinct forms.
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