Hemicidaridae

Hemicidaridae Temporal range: Jurassic- Cretaceous PreꞒ Ꞓ O S D C P T J K Pg N
Fossil of Asterocidaris species
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Infraclass:	Carinacea
Family:	†Hemicidaridae Wright, 1857

Pseudocidaris spine; Matmor Formation (Middle Jurassic) of Makhtesh Gadol, Israel.

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).[1]

Taxonomy

List of genera and subfamilies:[2][3]

• 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.[1]

References

1. "Fossilworks: Gateway to the Paleobiology Database". fossilworks.org. Archived from the original on 2022-03-25. Retrieved 2015-05-10.
2. "WoRMS - World Register of Marine Species - Hemicidaridae Wright, 1857 †". marinespecies.org. Retrieved 2015-05-10.
3. "BioLib - Hemicidaridae". biolib.cz. Retrieved 2015-05-10.