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Direct Paleobiological Analysis
Yangchuanosaurusvs.Allosaurus
A side-by-side scientific comparison of physiological dimensions, biomechanics, temporal horizons, and anatomical specializations.
Comparing 2 of maximum 4 specimens
TheropodaYangchuanosaurus
Yangchuanosaurus shangyouensis Dong et al., 1978
A colossal Chinese allosauroid that was the Asian equivalent of North America's Allosaurus.
TheropodaAllosaurus
Allosaurus fragilis Marsh, 1877
The most abundant apex theropod of Late Jurassic North America, equipped with a kinetic skull and slashing serrated teeth.
Comparative Paleobiological & Anatomical Matrix
| Feature / Trait | Yangchuanosaurus | Allosaurus |
|---|---|---|
Total Length | 8–10.8 m (26.2–35.4 ft) Estimated maximum | 8.5–9.7 m (27.9–31.8 ft) Estimated maximum |
Hip Height | 2.8–3.8 m (9.2–12.5 ft) Model estimate | 2.8–3.3 m (9.2–10.8 ft) Model estimate |
Body Mass | 2.0–3.5 metric tons (4,409–7,716 lbs) Volumetric/allometric model | 1.8–2.7 metric tons (3,968–5,952 lbs) Volumetric/allometric model |
Epoch Horizon | Jurassic Period 163–157 Ma (million years ago) | Jurassic Period 155–145 Ma (million years ago) |
Diet & Trophic Role | Carnivore Macropredator feeding on sauropods (Shunosaurus, Omeisaurus) and stegosaurs (Huayangosaurus). | Carnivore Sauropods (Diplodocus, Camarasaurus), stegosaurs, and ornithopods (Dryosaurus, Camptosaurus). |
Taxonomic Clade | Theropoda(Suborder) | Theropoda(Suborder) |
Fossil Localities | Shangyou Reservoir, Sichuan, China Named: 1977 | Garden Park, Canon City, Colorado, United States Named: 1877 |
Locomotion & Behavior | Dominant apex predator of Late Jurassic East Asia, possessing a deep skull, serrated teeth, and strong grasping forelimbs. In the Upper Shaximiao Formation of Sichuan, Yangchuanosaurus hunted large herbivores including the plated stegosaur [Tuojiangosaurus](/dinosaurs/tuojiangosaurus) and the colossal sauropod [Mamenchisaurus](/dinosaurs/mamenchisaurus). | Bonebed accumulations such as the Cleveland-Lloyd Dinosaur Quarry, where over 40 individual Allosaurus specimens were recovered, have sparked intense scientific discussion. Hypotheses range from catastrophic predator traps around toxic waterholes to drought-driven feeding aggregations. Bone pathologies show frequent fractures and healed injuries, indicating aggressive predatory life encounters and intraspecific fighting. |
Holotype & Fossils | Complete pristine articulated skeleton and skull mounted at the Chongqing Museum. | One of the richest fossil records of any large dinosaur, with thousands of bones and dozens of complete or near-complete skeletons known. Iconic specimens include O. C. Marsh's 1877 holotype (YPM 1930) and the subadult specimen MOR 693 ('Big Al'), which preserves 95% of its skeleton alongside 19 distinct bone pathologies. |
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.