Cidaris cidaris
| Cidaris cidaris | |
|---|---|
| Cidaris cidaris Dried specimen | |
| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Echinodermata | 
| Class: | Echinoidea | 
| Order: | Cidaroida | 
| Family: | Cidaridae | 
| Genus: | Cidaris | 
| Species: | C. cidaris | 
| Binomial name | |
| Cidaris cidaris | |
| Synonyms | |
| 
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Cidaris cidaris is a species of sea urchin commonly known as the long-spine slate pen sea urchin. It is found in deep water in the eastern Atlantic Ocean and the Mediterranean Sea.