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Chasmosaurine

Chasmosaurines
Temporal range: Late Cretaceous, 78–66 Ma
Chasmosaurus bellis RTM 01.jpg
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.


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.

Below is the phylogeny of Brown et al.


Centrosaurinae

Vagaceratops

Kosmoceratops

Chasmosaurus belli

Chasmosaurus russeli

Mojoceratops

Agujaceratops

Utahceratops

Pentaceratops

Bravoceratops

Coahuilaceratops

Anchiceratops

Arrhinoceratops

Regaliceratops

Eotriceratops


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Wikipedia

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