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Strongylocentrotus purpuratus is a species of sea urchin in the family Strongylocentrotidae, which is commonly known as the purple sea urchin. It lives along the eastern edge of the Pacific Ocean extending from Ensenada, Mexico, to British Columbia, Canada.
| Strongylocentrotus purpuratus | |
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Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Order: | Camarodonta |
| Family: | Strongylocentrotidae |
| Genus: | Strongylocentrotus |
| Species: | S. purpuratus
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| Binomial name | |
| Strongylocentrotus purpuratus (Stimpson, 1857)
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After one of its main predators, the sea otter, experienced a population decline, Strongylocentrotus purpuratus became a threat to the health of kelp forests as its own population boomed. The species is also used as a model organism and its genome was the first echinoderm genome to be sequenced.