Hemicidaridae
| Hemicidaridae Temporal range:
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|---|---|
| |
| Fossil of Asterocidaris species | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Infraclass: | Carinacea |
| Family: | †Hemicidaridae Wright, 1857 |
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[edit]
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[edit]
Fossils of species within this genus have been found in the Jurassic and Cretaceous sediments in Europe, Africa, North America and China.[1]
References[edit]
- ^ a b "Fossilworks: Gateway to the Paleobiology Database". fossilworks.org. Retrieved 2015-05-10.
- ^ "WoRMS - World Register of Marine Species - Hemicidaridae Wright, 1857 †". marinespecies.org. Retrieved 2015-05-10.
- ^ "BioLib - Hemicidaridae". biolib.cz. Retrieved 2015-05-10.
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