What makes Ouranosaurus scientifically significant?

Ouranosaurus provides critical insights into the evolutionary radiation of Ornithopoda. Holotypes and fossil evidence indicate: Two nearly complete articulated skeletons on display in Niamey and Venice.

Ouranosaurus (Ouranosaurus nigeriensis Taquet, 1976) - Size, Diet & Cretaceous Period Facts

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Ouranosaurus (Ouranosaurus nigeriensis Taquet, 1976) - Size, Diet & Cretaceous Period Facts | DinoOrigin

Evolutionary Taxonomy & Cladistics

View Dinosaur Phylogeny

Phylogenetic classification of Ouranosaurus nigeriensis Taquet, 1976 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	Ornithischia (Bird-Hipped Dinosaurs)	Characterized by a pelvis with a backwards-pointing pubis parallel to the ischium.
Suborder	Ornithopoda	Beaked, bipedal and facultatively quadrupedal herbivores with complex multi-layered dental batteries.
Genus	Ouranosaurus	Monophyletic prehistoric clade
Species	Ouranosaurus nigeriensis Taquet, 1976	Specific authority designation

Anatomy & Physical Characteristics

Ouranosaurus was a specialized iguanodontian dinosaur that lived alongside Suchomimus in the Early Cretaceous of Niger. Its most distinctive characteristic was a series of tall, flattened neural spines that projected from its back and tail, reaching up to six times the height of the vertebrae.

While early reconstructions depicted a thin reptilian sail for thermoregulation, the broad, rugose spine tips suggest it anchored a thick, energy-storing fat and muscle hump, similar to modern camels or bison.

Diagnostic Morphological Traits

Long-snouted iguanodontian with a tall dorsal ridge, thumb spike, broad duck-like beak, and four-toed feet.

Comparative Scale & Biometrics

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

Approx. 4.6× human length

Ouranosaurus (Length)7–8.3 m (23.0–27.2 ft)

Adult Human1.8 m (6.0 ft)

Length

7–8.3 m (23.0–27.2 ft)

Height

2.5–3 m (8.2–9.8 ft)

Estimated Mass

2.0–3.5 metric tons (4,409–7,716 lbs)

Diet & Feeding Ecology

All Herbivore Species

Trophic Guild: Herbivore

Low vegetation, leaves, ferns, and seeds ground with rows of cheek teeth.

Paleobiology & Behavior

Herbivorous iguanodontian with tall dorsal neural spines forming a distinctive sail or fleshy hump along its back. Inhabiting the tropical river deltas of Gadoufaoua, Ouranosaurus lived sympatrically with grazing sauropod Nigersaurus and was preyed upon by the large spinosaurid Suchomimus.

Habitat & Ecological Biome

Prehistoric Depositional Setting

Tropical floodplains, freshwater deltas, and seasonal dry savannahs of the Sahara.

Fossil Evidence & Specimen Records

Preserved Skeletal Material & Bonebeds

Two nearly complete articulated skeletons on display in Niamey and Venice.

Discovery & Taxonomic Naming History

Year of Discovery / Description1965

Type Specimen Locality & FormationElrhaz Formation, Gadoufaoua, Niger

Discovered by French paleontologist Philippe Taquet; described in 1976.

Geological Era & Chronostratigraphy

Explore All Cretaceous Period Fauna

Cretaceous Period PeriodTemporal Interval: 125–112 Ma (million years ago)

The longest and final period of the Mesozoic Era, characterized by the rise of flowering plants, ceratopsians, hadrosaurs, tyrannosaurids, and concluding with the Chicxulub asteroid impact.

Where It Lived & Paleoenvironment

Africa Dinosaurs

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

Paleogeographic RealmAfrica (Africa)

Featuring the Bahariya and Kem Kem deltaic systems of North Africa, home to colossal riverine theropods and unique freshwater ecosystems.

Fossil Discovery Locality

Scientific Significance & Evolutionary Impact

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

Phylogenetic Placement: Informs cladistic debates concerning the divergence, skull biomechanics, and skeletal evolution of Cretaceous Period fauna.
Paleoecological Guild: Documents trophic specialization (Herbivore) and predator-prey dynamics across its regional ecosystem.
Taphonomic Record: Two nearly complete articulated skeletons on display in Niamey and Venice.

Frequently Asked Questions About Ouranosaurus

Scientifically verified answers based on peer-reviewed paleontological evidence.

Q1.When did Ouranosaurus live?

Ouranosaurus lived during the Cretaceous Period Period, approximately 125–112 Ma (million years ago). This places it within the Mesozoic Era.

Q2.How big was Ouranosaurus?

Paleontological estimates place Ouranosaurus at a length of 7–8.3 m (23.0–27.2 ft), a hip/standing height of 2.5–3 m (8.2–9.8 ft), and a body mass of 2.0–3.5 metric tons (4,409–7,716 lbs).

Q3.What was the diet of Ouranosaurus?

Classified as a herbivore, Ouranosaurus specialized in consuming Low vegetation, leaves, ferns, and seeds ground with rows of cheek teeth..

Q4.Where were Ouranosaurus fossils discovered?

Fossil specimens of Ouranosaurus have been recovered from Elrhaz Formation, Gadoufaoua, Niger, with notable historic specimens documented in 1965. Discovered by French paleontologist Philippe Taquet; described in 1976.

Academic Literature & Peer-Reviewed References

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

Cahiers de Paléontologie, Éditions du CNRS, ParisView Publication
Taquet, P. (1976). Géologie et paléontologie du gisement de Gadoufaoua (Aptien du Niger). Cahiers de Paléontologie, Éditions du CNRS, Paris, 1-191.
Curated & Verified: 2026-09-24

Ouranosaurus

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