Unmounted Pachycephalosaurus Stegoceras validum skeleton cast replica
Unmounted Pachycephalosaurus Stegoceras validum skeleton cast replica
Unmounted Pachycephalosaurus Stegoceras validum skeleton cast replica

Unmounted Pachycephalosaurus Stegoceras validum skeleton cast replica

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Discounted cast  (*Normal retail price $4,895)

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
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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 validus Lambe, 1902
  • Troodon validus Gilmore, 1924
  • Stegoceras browni Wall & Galton, 1979
  • Ornatotholus browni Galton & Sues, 1983

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.

This is an unmounted cast skeleton.  We also offer the skeleton mounted.