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The Centrosaurinae are characterized by their prominent nasal horns, subordinate brow horns, short squamosals in a short frill, a tall, deep face relative to the ceratopines, and a projection into the rear of the nasal fenestra. They experienced their greatest diversity in the Judithian age of the Late Cretaceous, tailing off during the Edmontonian before apparently disappearing altogether in the Lancian. They also have more prominent cranial ornamentation, including a wide variety of spikes and nodules on the frill. It has been suggested that they wrestled with their nose horns by pushing against an opponent's horn.
[edit] Phylogeny
Ceratopsidae
|--Ceratopsinae
`--Centrosaurinae
|--Albertaceratops
`--+--Centrosaurini
| |--Centrosaurus
| `--Styracosaurus
`--Pachyrhinosaurini
|--Einiosaurus
`--+--Achelousaurus
`--Pachyrhinosaurus
[edit] References
Centrosaurinae
