Chasmosaurinae

Chasmosaurines
Temporal range: Late Cretaceous, 76.5–66 Ma
Chasmosaurus belli skeleton, Royal Tyrrell Museum of Palaeontology
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: †Ornithischia
Family: †Ceratopsidae
Subfamily: †Chasmosaurinae
Lambe, 1915
Type species
†Chasmosaurus belli
Lambe, 1902
Subgroups

See text.

Chasmosaurinae is a subfamily of ceratopsid dinosaurs. Triceratops is a well-known example. They were one of the most successful groups of herbivores of their time. Chasmosaurines appeared in the early Campanian, and became extinct, along with all other non-avian dinosaurs, during the Cretaceous–Paleogene extinction event. Broadly, the most distinguishing features of chasmosaurinae are prominent brow horns and long frills lacking long spines; centrosaurines generally had short brow horns and relatively shorter frills, and often had long spines projecting from their frills. Chasmosaurines are currently known definitively from rocks in western Canada, the western United States, and northern Mexico.

Genera

Below is the phylogeny of Brown et al.[4]

Ceratopsidae

Centrosaurinae


Chasmosaurinae


Vagaceratops

Kosmoceratops






Chasmosaurus belli

Chasmosaurus russeli

Mojoceratops

Agujaceratops

Utahceratops

Pentaceratops

Bravoceratops

Coahuilaceratops


Anchiceratops

Arrhinoceratops



Triceratopsini

Regaliceratops

Eotriceratops

Ojoceratops

Titanoceratops

Nedoceratops


Torosaurus latus

Torosaurus utahensis

Triceratops horridus

Triceratops prorsus











Regaliceratops Torosaurus Triceratops Titanoceratops Tatankaceratops Ojoceratops Eotriceratops Vagaceratops Utahceratops Pentaceratops Mojoceratops Mercuriceratops Medusaceratops Kosmoceratops Judiceratops Coahuilaceratops Chasmosaurus Bravoceratops Arrhinoceratops Anchiceratops Agujaceratops

See also

References

  1. ↑ Ryan, M. J.; Evans, D. C.; Currie, P. J.; Loewen, M. A. (2014). "A new chasmosaurine from northern Laramidia expands frill disparity in ceratopsid dinosaurs". Naturwissenschaften. doi:10.1007/s00114-014-1183-1.
  2. ↑ Spencer G. Lucas, Robert M. Sullivan and Adrain P. Hunt (2006). Re-evaluation of Pentaceratops and Chasmosaurus (Ornithischia: Ceratopsidae) in the Upper Cretaceous of the Western Interior. p. 4.
  3. ↑ Michael J. Ryan,Brenda J. Chinnery-Allgeier (n.d.). New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium. Royall Tyrell Museum. p. 500.
  4. ↑ Brown, Caleb M.; Henderson, Donald M. (June 4, 2015). "A new horned dinosaur reveals convergent evolution in cranial ornamentation in ceratopsidae". Current Biology (online). doi:10.1016/j.cub.2015.04.041.
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