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Euechinoidea (Subclass) ..Atelostomata (Superorder) - irregular urchins ..Diadematacea (Superorder) ..Echinacea (Superorder) ..Gnathostomata (Superorder) ....Clypeasteroida (Order) - true sand dollars ....Holectypoida (Order)

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Last updated: 28 Aug 2026