Image for the group Atelostomata

Atelostomata [superorder]

Cassiduloida [order]

Holasterina [suborder]

Holasteroida [order]

Urechinina [infraorder]

Urechinidae [family]

Pilematechinus [genus]

Spatangoida [order]

Schizasteridae [family]

Brisaster [genus]

Spatangidae [family]

Spatangus [genus]

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