Styracosaurus albertensis

Styracosaurus albertensis was a stocky, four-legged ceratopsid that lived on the coastal plains of southern Alberta late in the Campanian. Its combination of a massive nasal horn, small brow horns and elongated parietal spikes produced one of the most distinctive dinosaur skulls. A beak and dense batteries of slicing cheek teeth processed tough plants. The holotype includes a largely complete skull and most of the postcranial skeleton, while later skulls, skeletons and bonebed material reveal growth and individual variation. Modern work shows that no single perfectly symmetrical frill pattern defines every member of the species.

Its fossils occur between approximately 75.3 and 74.8 million years ago. Values shown here are approximate and reflect the current curated seed dataset.

The deep skull ended in a narrow, toothless beak backed by stacked dental batteries. A long nasal horn rose above the snout, while the brow horns were reduced compared with Triceratops. The parietosquamosal frill carried long spike-like epiossifications, usually with the largest projecting back and outward; their size, curvature, position and even number could differ between the two sides of one skull. A short, robust neck and powerful forequarters supported the heavy head. The barrel-shaped body stood on four columnar limbs, with hoof-like terminal bones on the main digits.

• Large nasal horn forming the dominant facial horn
• Reduced brow horns above the eyes
• Broad parietosquamosal frill edged by long spike-like epiossifications
• Individually variable and sometimes strongly asymmetric frill ornamentation
• Narrow keratinous beak for cropping vegetation
• Closely packed dental batteries with continuously replaced teeth
• Short robust neck and powerful forequarters supporting the skull
• Stocky quadrupedal body with a relatively short tail

Charles H. Sternberg discovered the skull of holotype CMN 344 in 1913 beside the Red Deer River in what is now Dinosaur Provincial Park. Lawrence M. Lambe described and illustrated it that December as Styracosaurus albertensis. Associated postcranial bones recovered later supplied most of the body skeleton now catalogued with the type. Further discoveries include AMNH 5372, once named Styracosaurus parksi, a nearly complete referred skeleton TMP 1989.097.1, small immature individuals and material from a multi-taxic bonebed. Together they changed Styracosaurus from a species reconstructed mainly from one skull into a sample that records growth and striking individual variation.

Discovery credit: Charles H. Sternberg.

Naming authors: Lawrence M. Lambe.

Styracosaurus is known from the upper Dinosaur Park Formation, deposited on a warm coastal plain east of the rising Rocky Mountains and west of the Western Interior Seaway. Rivers repeatedly flooded low forests, wetlands and poorly drained floodplains. Lambeosaurus and Prosaurolophus characterize the same upper assemblage zone, while armoured dinosaurs, small theropods and large tyrannosaurids occupied the broader ecosystem.

The beak cropped vegetation and the dental batteries sliced it before swallowing; exact preferred plants and feeding height are not known. The horn-and-frill complex could have contributed to visual display, species recognition, defence or combat, and these functions need not be exclusive. A bonebed containing Styracosaurus remains shows that multiple individuals could be associated at death, but it does not prove permanent herding. Variation and asymmetry in the frill also caution against assuming every ornament carried one rigid species-recognition signal.

• The Canadian Museum of Nature still curates and displays CMNFV 344, the name-bearing individual discovered in 1913.
• A later skull, UALVP 55900, has seven frill-edge bones on one side and eight on the other.
• The largest frill spikes were extensions of separate edge bones, not simply thin points grown from the frill sheet.
• The proposed synonymy of the Montana dinosaur Rubeosaurus ovatus with Styracosaurus rests partly on the newly recognized range of frill variation.
• The classic museum silhouette combines a very large nose horn with brow horns much smaller than those of Triceratops.

A research repository is not necessarily a public exhibit. Loan and display status can change, so check with the institution before visiting.

1. 01
   The Paleobiology Database

   Open source
2. 02
   Palaeobiology Collections

   Canadian Museum of Nature

   Open source
3. 03
   A new genus and species of Ceratopsia from the Belly River Formation of Alberta

   Lawrence M. Lambe · The Ottawa Naturalist · 1913

   Open source
4. 04
   A revision of the Late Campanian centrosaurine ceratopsid genus Styracosaurus from the Western Interior of North America

   Michael J. Ryan, Robert Holmes, Anthony P. Russell · Journal of Vertebrate Paleontology · 2007

   Open source
5. 05
   The postcranial skeleton of Styracosaurus albertensis

   Robert B. Holmes, Michael J. Ryan · Kirtlandia · 2013

   Open source
6. 06
   Morphological variation and asymmetrical development in the skull of Styracosaurus albertensis

   Robert B. Holmes, Walter Scott Persons, Baltej Singh Rupal and 2 coauthors · Cretaceous Research · 2020

   Open source
7. 07
   A subadult individual of Styracosaurus albertensis with comments on ontogeny and intraspecific variation in Styracosaurus and Centrosaurus

   Caleb M. Brown, Robert B. Holmes, Philip J. Currie · Vertebrate Anatomy Morphology Palaeontology · 2020

   Open source
8. 08
   Bucky the Giant Beaver Awaits Adoring Fans

   Canadian Museum of Nature · 2025

   Open source
9. 09
   Dinosaur Provincial Park

   UNESCO World Heritage Centre

   Open source