What makes Yangchuanosaurus scientifically significant?

Yangchuanosaurus provides critical insights into the evolutionary radiation of Theropoda. Holotypes and fossil evidence indicate: Complete pristine articulated skeleton and skull mounted at the Chongqing Museum.

Yangchuanosaurus (Yangchuanosaurus shangyouensis Dong et al., 1978) - Size, Diet & Jurassic Period Facts

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Yangchuanosaurus (Yangchuanosaurus shangyouensis Dong et al., 1978) - Size, Diet & Jurassic Period Facts | DinoOrigin

Evolutionary Taxonomy & Cladistics

View Dinosaur Phylogeny

Phylogenetic classification of Yangchuanosaurus shangyouensis Dong et al., 1978 based on peer-reviewed cladistic analyses of diagnostic skeletal synapomorphies.

Taxonomic Rank	Taxon / Clade	Diagnostic Context
Kingdom	Animalia	Monophyletic prehistoric clade
Phylum	Chordata	Monophyletic prehistoric clade
Clade	Dinosauria	Monophyletic prehistoric clade
Order	Saurischia (Lizard-Hipped Dinosaurs)	Characterized ancestrally by a triradiate pelvis with an anteriorly pointing pubis.
Suborder	Theropoda	Bipedal saurischian dinosaurs, historically dominated by carnivores and including the avian lineage.
Genus	Yangchuanosaurus	Monophyletic prehistoric clade
Species	Yangchuanosaurus shangyouensis Dong et al., 1978	Specific authority designation

Anatomy & Physical Characteristics

Yangchuanosaurus was the undisputed apex predator of the Late Jurassic Dashanpu ecosystem in Sichuan, China. Growing up to 10.8 meters in the largest species (Y. magnus), it possessed a deep skull with rugose nasal crests and massive jaw muscles.

Its long, muscular tail served as an effective counterbalance during rapid turns when pursuing massive contemporary sauropods like Omeisaurus.

Diagnostic Morphological Traits

Massive allosauroid skull with prominent facial rugosities and hornlets, strong neck, and heavy three-clawed hands.

Comparative Scale & Biometrics

Anatomical dimensions relative to an average adult human (1.8 m / 6 ft tall)

Approx. 6.0× human length

Yangchuanosaurus (Length)8–10.8 m (26.2–35.4 ft)

Adult Human1.8 m (6.0 ft)

Length

8–10.8 m (26.2–35.4 ft)

Height

2.8–3.8 m (9.2–12.5 ft)

Estimated Mass

2.0–3.5 metric tons (4,409–7,716 lbs)

Diet & Feeding Ecology

All Carnivore Species

Trophic Guild: Carnivore

Macropredator feeding on sauropods (Shunosaurus, Omeisaurus) and stegosaurs (Huayangosaurus).

Paleobiology & 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 and the colossal sauropod Mamenchisaurus.

Habitat & Ecological Biome

Prehistoric Depositional Setting

Subtropical lowland lake deltas and extensive river plains.

Fossil Evidence & Specimen Records

Preserved Skeletal Material & Bonebeds

Complete pristine articulated skeleton and skull mounted at the Chongqing Museum.

Discovery & Taxonomic Naming History

Year of Discovery / Description1977

Type Specimen Locality & FormationShangyou Reservoir, Sichuan, China

Uncovered by a construction worker during dam excavation; described by Dong Zhiming, Zhang Yihong, and Li Xuanmin.

Geological Era & Chronostratigraphy

Explore All Jurassic Period Fauna

Jurassic Period PeriodTemporal Interval: 163–157 Ma (million years ago)

Marked by lush greenhouse climates, the breakup of Pangaea, and the evolutionary explosion of sauropods, plated stegosaurs, and apex megalosauroid and allosauroid theropods.

Where It Lived & Paleoenvironment

Asia Dinosaurs

During the Mesozoic Era, continental drift progressively reconfigured land bridges, atmospheric currents, and regional precipitation regimes. Fossils of Yangchuanosaurus evidence its adaptation to the paleoenvironments of Asia.

Paleogeographic RealmAsia (Asia)

Renowned for the exceptionally preserved feathered dinosaurs of Liaoning, China and the Cretaceous dune habitats of the Gobi Desert in Mongolia.

Fossil Discovery Locality

Scientific Significance & Evolutionary Impact

The anatomical architecture of Yangchuanosaurus serves as a crucial benchmark in vertebrate paleontology, illustrating key adaptive radiations within Theropoda.

Phylogenetic Placement: Informs cladistic debates concerning the divergence, skull biomechanics, and skeletal evolution of Jurassic Period fauna.
Paleoecological Guild: Documents trophic specialization (Carnivore) and predator-prey dynamics across its regional ecosystem.
Taphonomic Record: Complete pristine articulated skeleton and skull mounted at the Chongqing Museum.

Frequently Asked Questions About Yangchuanosaurus

Scientifically verified answers based on peer-reviewed paleontological evidence.

Q1.When did Yangchuanosaurus live?

Yangchuanosaurus lived during the Jurassic Period Period, approximately 163–157 Ma (million years ago). This places it within the Mesozoic Era.

Q2.How big was Yangchuanosaurus?

Paleontological estimates place Yangchuanosaurus at a length of 8–10.8 m (26.2–35.4 ft), a hip/standing height of 2.8–3.8 m (9.2–12.5 ft), and a body mass of 2.0–3.5 metric tons (4,409–7,716 lbs).

Q3.What was the diet of Yangchuanosaurus?

Classified as a carnivore, Yangchuanosaurus specialized in consuming Macropredator feeding on sauropods (Shunosaurus, Omeisaurus) and stegosaurs (Huayangosaurus)..

Q4.Where were Yangchuanosaurus fossils discovered?

Fossil specimens of Yangchuanosaurus have been recovered from Shangyou Reservoir, Sichuan, China, with notable historic specimens documented in 1977. Uncovered by a construction worker during dam excavation; described by Dong Zhiming, Zhang Yihong, and Li Xuanmin.

Academic Literature & Peer-Reviewed References

Authoritative citations establishing the factual taxonomy, biometrics, and anatomy of Yangchuanosaurus.

Ke Xue Tong BaoView Publication
Dong, Z., Zhang, Y., Li, X., & Zhou, S. (1978). A new carnosaur from Yongchuan County, Sichuan Province. Ke Xue Tong Bao, 23(5), 302-304.
Curated & Verified: 2026-09-24

Yangchuanosaurus

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