| Hemicidaris Temporal range: Middle Jurassic-Early Cretaceous | |
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| Hemicidaris intermedia fossil from France in Cosmocaixa, Barcelona. | |
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| Genus: | Hemicidaris Agassiz, 1838 |
Hemicidaris is an extinct genus of echinoids that lived from the Middle Jurassic to the Early Cretaceous. Its remains have been found in Africa, Asia, and Europe.
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Nannopterygius is an extinct genus of ophthalmosaurid ichthyosaur that lived during the Middle Jurassic to the Early Cretaceous. Fossils are known from England, Kazakhstan, Russia, and Norway and six species are currently assigned to the genus.
Hemicidaridae is a family of extinct sea urchins characterized by large, massive, club-shaped spines.