Image for the group Euechinoidea
Euechinoidea [subclass]
Carinacea [infraclass]
Echinacea [superorder]
Camarodonta [order]
Echinidea [infraorder]
Odontophora [superfamily]
Strongylocentrotidae [family]
Strongylocentrotus [genus]
Strongylocentrotus cf. fragilis [species]
Strongylocentrotus purpuratus [species]
Echinothurioida [order]
Irregularia [infraclass]
Atelostomata [superorder]
Cassiduloida [order]
Holasterina [suborder]
Holasteroida [order]
Urechinina [infraorder]
Urechinidae [family]
Spatangoida [order]
Schizasteridae [family]
Spatangidae [family]
Spatangus [genus]
Spatangus californicus [species]
