Chasmosaurinae

Eumetazoa

Chasmosaurinae Temporal range: Late Cretaceous, 75–65 Ma PreЄ Є O S D C P T J K Pg N
Chasmosaurus, type species
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	Dinosauria
Order:	†Ornithischia
Suborder:	†Ceratopsia
Family:	†Ceratopsidae
Subfamily:	†Chasmosaurinae N. R. Longrich, 2010
Type species
Chasmosaurus belli Lambe, 1902

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 K-T extinction. 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

Phylogenetic relationships between Chasmosaurinae by Samson et al.

• Family Ceratopsidae
  • Subfamily Chasmosaurinae
    • Agujaceratops - (Texas, USA)
    • Anchiceratops - (Alberta, Canada)
    • Arrhinoceratops - (Alberta, Canada)
    • Chasmosaurus - (Alberta, Canada)
    • Coahuilaceratops - (Coahuila, Mexico)
    •  ? Dysganus - (Montana, USA)
    • Kosmoceratops - (Utah, USA)
    • Medusaceratops - (Montana, USA)
    • Mojoceratops - (Alberta & Saskatchewan, Canada)
    • Pentaceratops - (New Mexico, USA)^[1]
    •  ? Turanoceratops - (Uzbekistan)
    • Utahceratops - (Utah, USA)
    • Vagaceratops - (Alberta, Canada)
    • Tribe Triceratopsini
      • Agathaumas - (Wyoming, USA)
      • Eotriceratops - (Alberta, Canada)
      • Ojoceratops - (New Mexico, USA)^[2]
      • Polyonax - (Colorado, USA)
      • Tatankaceratops - (South Dakota, USA)
      • Titanoceratops - (New Mexico, USA)
      • Torosaurus - (Wyoming, Montana, South Dakota, North Dakota, & Utah, USA & Saskatchewan, Canada)
      • Triceratops - (Montana & Wyoming, USA & Saskatchewan & Alberta, Canada)

References

1. ^ SPENCER G. LUCAS, ROBERT M. SULLIVAN AND ADRIAN P. HUNT (2006). RE-EVALUATION OF PENTACERATOPS AND CHASMOSAURUS (ORNITHISCHIA: CERATOPSIDAE) IN THE UPPER CRETACEOUS OF THE WESTERN INTERIOR. pp. 4. ISBN ?. 
2. ^ Michael J. Ryan,Brenda J. Chinnery-Allgeier (?). New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium. Royall Tyrell Museum. pp. 500. ISBN ?. 

Links

• 1.http://paleodb.org/cgi-bin/bridge.pl

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