Hemicidaridae

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

These epifaunal grazer-deposit feeders lived in Jurassic and Cretaceous ages (from 189.6 to 112.6 Ma).

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 †
 * Hemicidaris (Sphaerotiaris) Lambert & Thiéry, 1914 †

Distribution
Fossils of species within this genus have been found in the Jurassic and Cretaceous sediments in Europe, Africa, North America and China.