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Kingdom: Animalia (Animal)
Phylum/Division: Echinodermata (Spiny-skinned animals: sea urchins, starfish, and their allies)
Subphylum/Subdivision: Echinozoa
Class: Echinoidea (sand dollars, sea urchins)
Subclass: Euechinoidea
Order: Echinoida
Family: Strongylocentrotidae
Genus: Strongylocentrotus
Species: Strongylocentrotus droebachiensis (Green Sea Urchin)

 

 

Species: Strongylocentrotus franciscanus (Red Sea Urchin)

 

 

 

Species: Strongylocentrotus purpuratus (Purple Sea Urchin)