Cassiduloida
Order of sea urchins / From Wikipedia, the free encyclopedia
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.[1]
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Order: | Cassiduloida L. Agassiz & Desor, 1847 |
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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.[1]