Carcharodontosaurus saharicus was one of the largest meat eating dinosaurs known from the Late Cretaceous of North Africa. Its name means shark toothed lizard because its long, serrated teeth resembled the cutting teeth of some sharks. Studying this predator helps paleontologists understand how giant theropods hunted, competed, and survived in warm floodplain environments about 100 to 94 million years ago.
It also shows that different continents produced different lineages of huge carnivores, not just the tyrannosaurs of North America and Asia.
Carcharodontosaurus belonged to a group called carcharodontosaurids, which were large allosauroid theropods with long skulls, powerful bodies, and blade like teeth. Fossils from Morocco, Algeria, and nearby regions suggest it lived among sauropods, ornithopods, fish rich waterways, and other predators such as spinosaurids. Its teeth were built for slicing flesh rather than crushing bone, so bite marks and tooth shape give clues about feeding behavior.
Paleontologists combine skull anatomy, limb proportions, sediment layers, and fossil comparisons to reconstruct how this animal moved through its ecosystem.
Key Facts
- Scientific name: Carcharodontosaurus saharicus, meaning shark toothed lizard from the Sahara.
- Time period: Late Cretaceous, about 100 to 94 million years ago.
- Estimated length: about 12 to 13 m, making it one of the largest known theropod dinosaurs.
- Estimated mass: about 6 to 8 metric tons, though values vary because fossils are incomplete.
- Speed relation: speed = distance/time, useful for estimating motion from trackways when fossil footprints are available.
- Radiometric decay model: N = N0(1/2)^(t/T), where T is the half life used to estimate ages of datable minerals near fossil layers.
Vocabulary
- Theropod
- A group of mostly meat eating dinosaurs that walked on two legs and includes Carcharodontosaurus, Allosaurus, Tyrannosaurus, and modern birds.
- Carcharodontosaurid
- A family of large theropod dinosaurs known for long skulls and serrated cutting teeth.
- Serration
- A small saw like edge on a tooth that helps it cut through flesh.
- Floodplain
- A flat area beside rivers that can flood and deposit layers of sand, silt, and mud where fossils may form.
- Trace fossil
- Evidence of an organism's activity, such as footprints, bite marks, or burrows, rather than the organism's body itself.
Common Mistakes to Avoid
- Calling Carcharodontosaurus a tyrannosaur, which is wrong because it belonged to the allosauroid carcharodontosaurid lineage, not the tyrannosaur lineage.
- Assuming bigger teeth mean a stronger bite, which is wrong because tooth shape, jaw muscles, skull structure, and feeding style all affect bite performance.
- Treating every size estimate as exact, which is wrong because many fossils are incomplete and mass estimates depend on reconstruction methods.
- Placing Carcharodontosaurus with Jurassic dinosaurs, which is wrong because it lived in the Late Cretaceous millions of years after classic Jurassic predators such as Allosaurus.
Practice Questions
- 1 A Carcharodontosaurus is estimated to be 12.5 m long. If a museum scale model is built at 1:25 scale, how long should the model be in meters?
- 2 A fossil layer is dated to 96 million years ago. If Carcharodontosaurus lived from about 100 to 94 million years ago, does this layer fall within its likely time range, and how many million years after 100 million years ago is it?
- 3 Carcharodontosaurus had long, serrated teeth while some other large predators had thicker, more crushing teeth. Explain what this difference suggests about feeding style and the type of evidence paleontologists would look for.