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Direct Paleobiological Analysis
Utahraptorvs.Acrocanthosaurus
A side-by-side scientific comparison of physiological dimensions, biomechanics, temporal horizons, and anatomical specializations.
Comparing 2 of maximum 4 specimens
TheropodaUtahraptor
Utahraptor ostrommaysi Kirkland et al., 1993
The colossal king of the dromaeosaurids, a 6-meter, half-ton apex ambush predator with 24-centimeter foot claws.
TheropodaAcrocanthosaurus
Acrocanthosaurus atokensis Stovall & Langston, 1950
A high-spined North American apex predator famous for hunting sauropods across Early Cretaceous river valleys.
Comparative Paleobiological & Anatomical Matrix
| Feature / Trait | Utahraptor | Acrocanthosaurus |
|---|---|---|
Total Length | 5–6 m (16.4–19.7 ft) Estimated maximum | 10–11.5 m (32.8–37.7 ft) Estimated maximum |
Hip Height | 1.6–1.9 m (5.2–6.2 ft) Model estimate | 3.4–4 m (11.2–13.1 ft) Model estimate |
Body Mass | 400–600 kg (882–1,323 lbs) Volumetric/allometric model | 4.5–6.5 metric tons (9,921–14,330 lbs) Volumetric/allometric model |
Epoch Horizon | Cretaceous Period 135–130 Ma (million years ago) | Cretaceous Period 113–110 Ma (million years ago) |
Diet & Trophic Role | Carnivore Iguanodonts (Iguanacolossus) and armored ankylosaurs (Gastonia). | Carnivore Hunted sauropods like Sauroposeidon and ornithopods like Tenontosaurus. |
Taxonomic Clade | Theropoda(Suborder) | Theropoda(Suborder) |
Fossil Localities | Cedar Mountain Formation, Utah, United States Named: 1991 | Antlers Formation, Atoka County, Oklahoma, United States Named: 1940 |
Locomotion & Behavior | Colossal dromaeosaurid predator reaching up to 5.5 meters in length and weighing over 300 kg, equipped with devastating 24 cm sickle claws. In the Cedar Mountain Formation of Utah, Utahraptor was the apex dromaeosaurid, serving as a massive evolutionary precursor to later Cretaceous relatives like [Deinonychus](/dinosaurs/deinonychus) and [Velociraptor](/dinosaurs/velociraptor). | Apex pursuit predator that shared the Early Cretaceous coastal plain ecosystem with contemporary dromaeosaurids like [Deinonychus](/dinosaurs/deinonychus) and large ornithopods like [Tenontosaurus](/dinosaurs/tenontosaurus). Trackway assemblages and body fossils indicate it operated as the dominant carnivore across these ancient river deltas. |
Holotype & Fossils | Spectacular multi-individual nine-ton sandstone megablock preserving multiple Utahraptors and prey. | Spectacular complete specimen 'Fran' (NCSM 14345) mounted at the North Carolina Museum of Natural Sciences. |
Paleontological Uncertainty Advisory: Anatomical dimensions, body masses, and metabolic rates are scientific estimates derived from volumetric scaling, laser scanning, and biomechanical limb bone allometry. Missing traits indicate non-preserved fossil elements rather than anatomical absence.