Styracosaurus was a horned dinosaur that lived in western North America during the Late Cretaceous Period, about 75 million years ago. Its name means "spiked lizard," which fits its huge neck frill lined with long spikes. Like other ceratopsians, it was a plant eater with a heavy body, a beaked mouth, and strong limbs.
Studying Styracosaurus helps paleontologists understand dinosaur diversity, evolution, and ecosystems before the end-Cretaceous extinction.
The best-known species, Styracosaurus albertensis, is strongly associated with fossil beds in Alberta, Canada. Its long nasal horn and spiked frill may have helped with display, species recognition, defense, or competition within the group. Fossil skulls show that ceratopsian frills were not all shaped the same, which gives scientists clues about growth and variation.
By comparing bones, rock layers, and fossil locations, paleontologists reconstruct how Styracosaurus lived in floodplain habitats alongside other dinosaurs.
Key Facts
- Scientific name: Styracosaurus albertensis.
- Time period: Late Cretaceous, about 75 million years ago.
- Estimated length: about 5.5 m from nose to tail.
- Estimated mass: about 2,000 to 3,000 kg, similar to a large rhinoceros.
- Main skull features: one long nasal horn, a large frill, and several long spikes around the frill edge.
- Geologic time formula: age difference = older age - younger age.
Vocabulary
- Ceratopsian
- A member of a group of herbivorous dinosaurs known for beaked jaws, frills, and often horns.
- Frill
- A bony shield-like structure extending from the back of the skull in ceratopsian dinosaurs.
- Nasal horn
- A horn growing from the nose region of an animal's skull.
- Fossil formation
- A named body of rock layers that contains fossils and records a specific part of Earth's history.
- Late Cretaceous
- The final part of the Cretaceous Period, lasting from about 100.5 to 66 million years ago.
Common Mistakes to Avoid
- Calling Styracosaurus a Triceratops, which is wrong because they are different ceratopsian dinosaurs with different horn and frill arrangements.
- Assuming the frill spikes were only weapons, which is too simple because they may also have been used for display, species recognition, or mating competition.
- Thinking all Styracosaurus fossils look identical, which is wrong because individuals can vary with age, sex, injury, and natural variation.
- Placing Styracosaurus at the dinosaur extinction event, which is inaccurate because it lived about 75 million years ago, roughly 9 million years before the end-Cretaceous extinction.
Practice Questions
- 1 Styracosaurus lived about 75 million years ago, and the end-Cretaceous extinction happened about 66 million years ago. How many million years before the extinction did Styracosaurus live?
- 2 If a Styracosaurus was 5.5 m long and a scale drawing shows it as 22 cm long, what scale was used in centimeters per meter?
- 3 A fossil skull has a single long nasal horn, a large frill, and several long spikes along the back of the frill. Explain why these traits would support identifying it as Styracosaurus rather than Triceratops.