Stegoceras

Stegoceras is an extinct genus of dome-headed pachycephalosaurian dinosaurs known from Late Cretaceous North America. Its fossils preserve a thick, ornamented skull roof and parts of the postcranial skeleton.

Pachycephalosauria: A group of herbivorous or omnivorous ornithischian dinosaurs characterized by thickened skull roofs. Stegoceras belongs to this group of dome-headed dinosaurs.
Bone histology: The microscopic study of bone tissue and its growth, remodeling, and preservation. Thin sections of pachycephalosaur skulls help track dome growth in Stegoceras.
Stegoceras validum: A species of Stegoceras known from Late Cretaceous deposits in western North America. It is the best-known species and provides much of the genus's anatomical record.
Dinosaur Park Formation: A fossil-rich rock formation in Alberta, Canada, deposited during the Campanian stage of the Late Cretaceous. Stegoceras fossils from this formation anchor its record in western Canada.
Pachycephalosaur taxonomy: The classification of pachycephalosaurian dinosaurs and the relationships among their named taxa. Reassignment of fragmentary skulls has changed which fossils count as Stegoceras.
Pachycephalosauridae: A family of pachycephalosaurian dinosaurs that includes thick-skulled forms such as Stegoceras. This family contains Stegoceras and its closest dome-headed relatives.
Ontogeny: The development of an individual organism from early life to adulthood. Growth stages help explain how the Stegoceras skull changed as individuals matured.
Hanssuesia: A genus of pachycephalosaurian dinosaur from Late Cretaceous North America. Its taxonomic history includes specimens once assigned to Stegoceras.
Campanian: A stage of the Late Cretaceous spanning approximately 83.6 to 72.1 million years ago. Stegoceras lived during this interval of the Late Cretaceous.
Pachycephalosaur ontogeny: The growth-related anatomical changes of pachycephalosaurian dinosaurs. It remains difficult to separate species differences from age-related skull changes.

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MarginocephaliaBroader topic: Its domed skull provides an early-known example of pachycephalosaur anatomy.