Tetrapygus
| Tetrapygus niger | |
|---|---|
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Order: | Arbacioida |
| Family: | Arbaciidae |
| Genus: | Tetrapygus L. Agassiz, 1841 |
| Species: | T. niger |
| Binomial name | |
| Tetrapygus niger (Molina, 1782) | |
| Synonyms | |
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Tetrapygus is a genus of sea urchins in the family Arbaciidae. It is a monotypic genus and the only species is Tetrapygus niger which was first described by the Chilean naturalist Juan Ignacio Molina in 1782. It is found in the southeastern Pacific Ocean on the coasts of South America.