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Hemicidaridae

Hemicidaridae is a family of extinct sea urchins characterized by large, massive, club-shaped spines.

Taxonomy
List of genera and subfamilies: • Subfamily Hemicidarinae Wright, 1857 † :Asterocidaris Cotteau, 1859 † :Gymnocidaris L. Agassiz, 1838 † : Hemicidaris L. Agassiz, 1838 † • Subfamily Pseudocidarinae Smith & Wright, 1993 † :Cidaropsis Cotteau, 1863 † :Pseudocidaris Pomel, 1883 † :Gymnocidaris L. Agassiz, 1838 † ==Distribution==
Distribution
Fossils of species within this genus have been found in the Jurassic and Cretaceous sediments in Europe, Africa, North America and China. ==References==
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