Cassiduloida

Cassiduloida is an order of sea urchins. The group was extremely diverse with many families and species during the Mesozoic, but today, only seven extant species remain.

Cassiduloida
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Scientific classification
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Cassiduloida

L. Agassiz & Desor, 1847
Families

Echinolampadidae
Neolampadidae

A 2019 phylogenetic systematics study by Souto et al. presented a revised classification of the cassiduloids, and hypothesised that the order probably originated in the Early Cretaceous.

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