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Atelostomata (Superorder) - irregular urchins ..†Nucleolitoida (Order) ..Pourtalesioida (Order) ..Spatangoida (Order) ..Cassiduloida (Order) ....Apatopygidae (Family) ....Cassidulidae (Family) ....Echinolampadidae (Family) ....Neolampadidae (Family) ....Pliolampadidae (Family)

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Last updated: 28 Aug 2026