Camptosaurus was a plant eating dinosaur that lived during the Late Jurassic Period, about 157 to 145 million years ago. It is important because it helps paleontologists understand how early ornithopod dinosaurs moved, fed, and survived in floodplain ecosystems. Fossils of Camptosaurus have been found mainly in western North America, especially in rocks of the Morrison Formation.
Its body plan shows a mix of speed, balance, and flexible feeding behavior.
Key Facts
- Time period: Late Jurassic, about 157 to 145 million years ago.
- Length: about 5 to 7 m for many adult Camptosaurus individuals.
- Diet: herbivore, feeding on low growing plants such as ferns, cycads, horsetails, and conifers.
- Body plan: long hind limbs, shorter forelimbs, a stiff balancing tail, and a beaked mouth.
- Estimated walking speed can be compared using speed = distance / time.
- Fossil evidence includes skulls, teeth, limb bones, vertebrae, pelvis bones, and partial skeletons.
Vocabulary
- Camptosaurus
- Camptosaurus was a Late Jurassic herbivorous dinosaur known for its flexible body and ornithopod features.
- Ornithopod
- An ornithopod is a group of mostly plant eating dinosaurs with bird like hips and adaptations for walking or running on two legs.
- Morrison Formation
- The Morrison Formation is a famous Late Jurassic rock unit in western North America that preserves many dinosaur fossils.
- Herbivore
- A herbivore is an animal that gets its energy by eating plants or plant material.
- Fossil assemblage
- A fossil assemblage is a group of fossils found together that helps scientists reconstruct an ancient environment.
Common Mistakes to Avoid
- Calling Camptosaurus a carnivore is wrong because its beak, teeth, and jaw structure show adaptations for eating plants.
- Assuming every dinosaur walked the same way is wrong because limb proportions show that Camptosaurus could likely move on two legs and may also have used its forelimbs at times.
- Treating fossil reconstructions as exact photographs is wrong because missing bones, crushed fossils, and comparisons with related species require scientific interpretation.
- Confusing Camptosaurus with Iguanodon is wrong because they are related ornithopods but differ in size, anatomy, time range, and some skull and hand features.
Practice Questions
- 1 A Camptosaurus walks 120 m across a floodplain in 60 s. What is its average speed in m/s?
- 2 An adult Camptosaurus is estimated to be 6 m long. If its tail makes up about 40 percent of its body length, how long is the tail?
- 3 A fossil site contains Camptosaurus teeth, plant fossils, river sediments, and bones of predators. Explain what this evidence suggests about the habitat and food web.