What makes Staurikosaurus scientifically significant?

Staurikosaurus provides critical insights into the evolutionary radiation of Theropoda. Holotypes and fossil evidence indicate: Partial skeleton consisting of vertebrae, pelvis, and hind limbs housed at Harvard MCZ.

Staurikosaurus (Staurikosaurus pricei Colbert, 1970) - Size, Diet & Triassic Period Facts

DinoOrigin.comEncyclopedia of Prehistoric LifePrehistoric Encyclopedia

Staurikosaurus (Staurikosaurus pricei Colbert, 1970) - Size, Diet & Triassic Period Facts | DinoOrigin

Evolutionary Taxonomy & Cladistics

View Dinosaur Phylogeny

Phylogenetic classification of Staurikosaurus pricei Colbert, 1970 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	Staurikosaurus	Monophyletic prehistoric clade
Species	Staurikosaurus pricei Colbert, 1970	Specific authority designation

Anatomy & Physical Characteristics

Staurikosaurus is an early carnivorous dinosaur known from the Carnian beds of the Santa Maria Formation of southern Brazil. Bearing a lightly constructed skeleton with primitive pelvic and vertebral architecture, it was a swift cursorial predator adapted to hunting small vertebrates.

Phylogenetically, Staurikosaurus is often grouped within Herrerasauridae, but whether this family represents an early-diverging theropod lineage or a more basal branch of Saurischia outside eusaurischians remains debated among paleontologists.

Diagnostic Morphological Traits

Lightly constructed body, deep lower jaw, elongate slender legs, and long stiffening tail.

Comparative Scale & Biometrics

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

Approx. 1.4× human length

Staurikosaurus (Length)2–2.5 m (6.6–8.2 ft)

Adult Human1.8 m (6.0 ft)

Length

2–2.5 m (6.6–8.2 ft)

Height

0.7–0.9 m (2.3–3.0 ft)

Estimated Mass

25–40 kg (55–88 lbs)

Diet & Feeding Ecology

All Carnivore Species

Trophic Guild: Carnivore

Carnivorous; consumed small cynodonts, rhynchosaurs, and archosauromorphs.

Paleobiology & Behavior

Small, agile predatory dinosaur representing one of the earliest known branches of Saurischia. Preserved in the Late Triassic Santa Maria Formation of Brazil, Staurikosaurus was ecologically and phylogenetically comparable to Argentine contemporaries like Herrerasaurus.

Habitat & Ecological Biome

Prehistoric Depositional Setting

Seasonal tropical woodland and braided river floodplains.

Fossil Evidence & Specimen Records

Preserved Skeletal Material & Bonebeds

Partial skeleton consisting of vertebrae, pelvis, and hind limbs housed at Harvard MCZ.

Discovery & Taxonomic Naming History

Year of Discovery / Description1936

Type Specimen Locality & FormationSanta Maria Formation, Rio Grande do Sul, Brazil

Found by Brazilian paleontologist Llewellyn Ivor Price; formally described by Edwin H. Colbert in 1970.

Geological Era & Chronostratigraphy

Explore All Triassic Period Fauna

Triassic Period PeriodTemporal Interval: 233.2–225 Ma (million years ago)

The dawn of the Mesozoic Era. Dinosaurs first emerged in the Late Triassic following the catastrophic Permian-Triassic extinction event, initially occupying modest niches alongside crurotarsan archosaurs.

Where It Lived & Paleoenvironment

South America Dinosaurs

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

Paleogeographic RealmSouth America (South America)

Preserved within the Huincul, Candeleros, and Ischigualasto formations, hosting colossal titanosaurs and specialized abelisaurid and carcharodontosaurid apex predators.

Fossil Discovery Locality

Scientific Significance & Evolutionary Impact

The anatomical architecture of Staurikosaurus 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 Triassic Period fauna.
Paleoecological Guild: Documents trophic specialization (Carnivore) and predator-prey dynamics across its regional ecosystem.
Taphonomic Record: Partial skeleton consisting of vertebrae, pelvis, and hind limbs housed at Harvard MCZ.

Frequently Asked Questions About Staurikosaurus

Scientifically verified answers based on peer-reviewed paleontological evidence.

Q1.When did Staurikosaurus live?

Staurikosaurus lived during the Triassic Period Period, approximately 233.2–225 Ma (million years ago). This places it within the Mesozoic Era.

Q2.How big was Staurikosaurus?

Paleontological estimates place Staurikosaurus at a length of 2–2.5 m (6.6–8.2 ft), a hip/standing height of 0.7–0.9 m (2.3–3.0 ft), and a body mass of 25–40 kg (55–88 lbs).

Q3.What was the diet of Staurikosaurus?

Classified as a carnivore, Staurikosaurus specialized in consuming Carnivorous; consumed small cynodonts, rhynchosaurs, and archosauromorphs..

Q4.Where were Staurikosaurus fossils discovered?

Fossil specimens of Staurikosaurus have been recovered from Santa Maria Formation, Rio Grande do Sul, Brazil, with notable historic specimens documented in 1936. Found by Brazilian paleontologist Llewellyn Ivor Price; formally described by Edwin H. Colbert in 1970.

Academic Literature & Peer-Reviewed References

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

American Museum NovitatesView Publication
Colbert, E. H. (1970). A saurischian dinosaur from the Triassic of Brazil. American Museum Novitates, 2405, 1-39.
Curated & Verified: 2026-09-24

Staurikosaurus

Quick Facts