Knowra Pachyrhinosaurus Pachyrhinosaurus Pachyrhinosaurus is an extinct genus of ceratopsid dinosaurs from Late Cretaceous North America, distinguished by a broad, thickened bony boss over its nose instead of a nasal horn.
Ceratopsidae : Ceratopsidae is the family of large, horned, frilled dinosaurs that includes Triceratops and its relatives. Pachyrhinosaurus belongs to this family of horned, frilled herbivores.
Pachyrhinosaurus canadensis : Pachyrhinosaurus canadensis is a species of Pachyrhinosaurus known from Late Cretaceous deposits in Alberta, Canada. It is the type species, named from Alberta fossils.
Cranial ornamentation : Cranial ornamentation is the development of structures such as horns, crests, and bosses on an animal's skull. The nasal boss and frill are the genus's most conspicuous cranial ornaments.
Triceratops : Triceratops is a genus of Late Cretaceous ceratopsid dinosaurs with two long brow horns and a short nasal horn. Unlike Triceratops, Pachyrhinosaurus had a thick nasal boss instead of a nasal horn.
Ceratopsia : Ceratopsia is the dinosaur group that includes horned, frilled forms and their close relatives. This broader group places ceratopsids within dinosaur evolution.
Pachyrhinosaurus lakustai : Pachyrhinosaurus lakustai is a species known from the Wapiti Formation of Alberta, Canada. Its fossils include a large bonebed that preserves many individuals.
Ontogeny : Ontogeny is the development of an individual organism from its earliest stage to adulthood. Changes in fossil skulls help distinguish growth stages from separate species.
Centrosaurus : Centrosaurus is a genus of ceratopsid dinosaurs known for a prominent nasal horn and a short frill. Its pronounced nasal horn contrasts with the broad boss of Pachyrhinosaurus.
Ceratopsian skull : A ceratopsian skull bears a beak, cheek teeth, and often a bony frill and facial horns or bosses. Its boss and frill are specialized features of the ceratopsian skull.
Pachyrhinosaurus perotorum : Pachyrhinosaurus perotorum is a species identified from Late Cretaceous deposits in Alaska. It extends the genus's known range into high-latitude Alaska.
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