Cast of Stegoceras validum UALVP 2, the first complete Pachycephalosaur skeleton.
Stegoceras skull and skeleton cast. Not to be confused with with Stegosaurus, thiis Pachycepholosaur cast is one of the smallest "Pachys" available.
Molded from the original fossils this skeleton will make a great addition to any museum collection.
Stegoceras "roofed horn" skull cast measures 8 inches long, 6 inches high and 5 inches wide.
Skeleton measures ____.
- George F. Sternberg
- Geologic Age
- Mesozoic - Cretaceous - Upper/Late - Campanian
- Record Last Modified
- 7 May 2020
- Skeletal Morphology
- Skull elements, skull with lower jaws (cast).
- Specimen Count
- Belly River Group - Oldman Fm
- Collection Date
- USNM Number
- Prep Count
- Alberta, Canada
- Published Name
- Stegoceras validum Lambe, 1902
- See more items in
- Reptiles / Amphibians
- Reptilia Dinosauria Pachycephalosauria
- Common name
- Animalia Chordata Vertebrata Sauropsida Reptilia Archosauria Dinosauria Ornithischia Pachycephalosauria Pachycephalosauridae
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Pachycephalosaurus Stegoceras validum
Stegoceras was a small, bipedal dinosaur about 2 to 2.5 metres (6.6 to 8.2 ft) long, and weighed around 10 to 40 kilograms (22 to 88 lb). The skull was roughly triangular with a short snout, and had a thick, broad, and relatively smooth dome on the top. The back of the skull had a thick "shelf" over the occiput, and it had a thick ridge over the eyes. Much of the skull was ornamented by tubercles (or round "outgrowths") and nodes (or "knobs"), many in rows, and the largest formed small horns on the shelf. The teeth were small and serrated. The skull is thought to have been flat in juvenile animals and to have grown into a dome with age. It had a rigid vertebral column, and a stiffened tail. The pelvic region was broad, perhaps due to an extended gut.
Originally known only from skull domes, Stegoceras was one of the first known pachycephalosaurs, and the incompleteness of these initial remains led to many theories about the affinities of this group. A complete Stegoceras skull with associated parts of the skeleton was described in 1924, which shed more light on these animals. Pachycephalosaurs are today grouped with the horned ceratopsians in the group Marginocephalia. Stegoceras itself has been considered basal (or "primitive") compared to other pachycephalosaurs. Stegoceras was most likely herbivorous, and it probably had a good sense of smell. The function of the dome has been debated, and competing theories include use in intra-specific combat (head or flank-butting), sexual display, or species recognition. S. validum is known from the Dinosaur Park Formation and the Oldman Formation, whereas S. novomexicanum is from the Fruitland and Kirtland Formation.