What makes Monolophosaurus scientifically significant?

Monolophosaurus provides critical insights into the evolutionary radiation of Theropoda. Holotypes and fossil evidence indicate: Nearly complete, exquisitely preserved articulated holotype skull and skeleton (IVPP 84019).

Monolophosaurus (Monolophosaurus jiangi Zhao & Currie, 1993) - Size, Diet & Jurassic Period Facts

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Monolophosaurus (Monolophosaurus jiangi Zhao & Currie, 1993) - Size, Diet & Jurassic Period Facts | DinoOrigin

Evolutionary Taxonomy & Cladistics

View Dinosaur Phylogeny

Phylogenetic classification of Monolophosaurus jiangi Zhao & Currie, 1993 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	Monolophosaurus	Monophyletic prehistoric clade
Species	Monolophosaurus jiangi Zhao & Currie, 1993	Specific authority designation

Anatomy & Physical Characteristics

Monolophosaurus was a medium-sized carnivorous tetanuran from the Shishugou Formation of the Junggar Basin in northwestern China. Its most diagnostic feature is a long, delicate single crest that ran along the midline of the snout from the premaxillae back to the frontals.

Internal pneumatic chambers within the crest indicate it was hollow and fragile, functioning primarily as a visual signaling structure rather than a weapon.

Diagnostic Morphological Traits

Slender biped with a continuous bony ridge running along the top of the skull from nostrils to eyes.

Comparative Scale & Biometrics

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

Approx. 3.2× human length

Monolophosaurus (Length)5–5.8 m (16.4–19.0 ft)

Adult Human1.8 m (6.0 ft)

Length

5–5.8 m (16.4–19.0 ft)

Height

1.6–1.9 m (5.2–6.2 ft)

Estimated Mass

450–700 kg (992–1,543 lbs)

Diet & Feeding Ecology

All Carnivore Species

Trophic Guild: Carnivore

Carnivorous; hunted small to medium-sized herbivores with serrated ziphodont teeth.

Paleobiology & Behavior

Medium-sized predatory theropod characterized by a single prominent midline crest along the roof of its skull. In the Shishugou Formation of China, Monolophosaurus coexisted with allied metriacanthosaurids like Sinraptor and basal tyrannosauroids like Guanlong.

Habitat & Ecological Biome

Prehistoric Depositional Setting

Forest-fringed lakes and volcanic floodplain environments in the Junggar Basin.

Fossil Evidence & Specimen Records

Preserved Skeletal Material & Bonebeds

Nearly complete, exquisitely preserved articulated holotype skull and skeleton (IVPP 84019).

Discovery & Taxonomic Naming History

Year of Discovery / Description1981

Type Specimen Locality & FormationShishugou Formation, Xinjiang, China

Discovered by petroleum geologist Dong Zhiming; named by Zhao Xijin and Philip J. Currie in 1993.

Geological Era & Chronostratigraphy

Explore All Jurassic Period Fauna

Jurassic Period PeriodTemporal Interval: 165–161 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 Monolophosaurus 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 Monolophosaurus 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: Nearly complete, exquisitely preserved articulated holotype skull and skeleton (IVPP 84019).

Frequently Asked Questions About Monolophosaurus

Scientifically verified answers based on peer-reviewed paleontological evidence.

Q1.When did Monolophosaurus live?

Monolophosaurus lived during the Jurassic Period Period, approximately 165–161 Ma (million years ago). This places it within the Mesozoic Era.

Q2.How big was Monolophosaurus?

Paleontological estimates place Monolophosaurus at a length of 5–5.8 m (16.4–19.0 ft), a hip/standing height of 1.6–1.9 m (5.2–6.2 ft), and a body mass of 450–700 kg (992–1,543 lbs).

Q3.What was the diet of Monolophosaurus?

Classified as a carnivore, Monolophosaurus specialized in consuming Carnivorous; hunted small to medium-sized herbivores with serrated ziphodont teeth..

Q4.Where were Monolophosaurus fossils discovered?

Fossil specimens of Monolophosaurus have been recovered from Shishugou Formation, Xinjiang, China, with notable historic specimens documented in 1981. Discovered by petroleum geologist Dong Zhiming; named by Zhao Xijin and Philip J. Currie in 1993.

Academic Literature & Peer-Reviewed References

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

Canadian Journal of Earth SciencesView Publication
Zhao, X.-J., & Currie, P. J. (1993). A large crested carnosaur (Dinosauria, Theropoda) from the Jurassic of Xinjiang, People's Republic of China. Canadian Journal of Earth Sciences, 30(10), 2027-2036. https://doi.org/10.1139/e93-178
Curated & Verified: 2026-09-24

Monolophosaurus

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