Biology:Hemicidaridae

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Short description: Extinct family of sea urchins

Hemicidaridae
Temporal range: Jurassic- Cretaceous
Hemicidaridae - Asterocidaris species.JPG
Fossil of Asterocidaris species
Scientific classification e
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

Wikidata ☰ Q15535510 entry