Hemicidaridae

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

Hemicidaridae
Temporal range: Jurassic- Cretaceous
Fossil of Asterocidaris species
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Infraclass: Carinacea
Family: †Hemicidaridae
Wright, 1857
Pseudocidaris spine; Matmor Formation (Middle Jurassic) of Makhtesh Gadol, Israel.

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]

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References
  1. "Fossilworks: Gateway to the Paleobiology Database". fossilworks.org. 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.


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