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.

Taxonomy

List of genera and subfamilies:

Subfamily Hemicidarinae Wright, 1857 †
Subfamily Pseudocidarinae Smith & Wright, 1993 †
Distribution

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