Hemicidaridae Explained

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]

Notes and References

1. Web site: Fossilworks: Gateway to the Paleobiology Database . fossilworks.org . 2015-05-10 . 2022-03-25 . https://web.archive.org/web/20220325060448/http://www.fossilworks.org/cgi-bin/bridge.pl?action=home . dead .
2. Web site: WoRMS - World Register of Marine Species - Hemicidaridae Wright, 1857 † . marinespecies.org. 2015-05-10.
3. Web site: BioLib - Hemicidaridae . biolib.cz. 2015-05-10.