Body length
InferredAbout 4.2 m (museum reference)
Educational genus estimate, without an identified measured fossil individual or maturity statement. [D3]
EXHIBIT 235
Piatnitzkysaurus
Piatnitzkysaurus floresi
Dinosaur
Piatnitzkysaurus was a Patagonian theropod with comparatively long, functional forelimbs. [2]
TWO WAYS TO PICTURE THE PAST
Science & the silver screen
Compare the evidence with the familiar movie image. The illustrations are not to a shared scale.
01 / SOURCE-INFORMED RECONSTRUCTION
A life reconstruction from the evidence
Image unavailableIllustrative life reconstruction of Piatnitzkysaurus in a period-appropriate environment; coloration and missing anatomy are interpretations.The exhibit and its credited image source remain available.
An illustrative reconstruction. Compare its anatomy with the evidence and limitations in the dossier. [2]
Source-informed reconstruction. Appearance evidence [2]. Original illustration; missing anatomy, coloration and scenery include interpretation.
Fossils constrain this life reconstruction. Missing anatomy, coloration and the environmental scene include interpretation; the dossier explains the evidence limits.
02 / MOVIE-STYLE INTERPRETATION
A cinematic imagination
Image unavailableIllustrative reconstruction of Piatnitzkysaurus floresi; missing anatomy, pose, skin and colors are hypotheses.The exhibit and its credited image source remain available.
An illustrative reconstruction. Compare its anatomy with the evidence and limitations in the dossier. Lighting, coloration and scenery are artistic choices. This image does not document a fossil locality or behavior.
Original artwork · artistic interpretation.
Scientific view: source-informed reconstruction, credited paleoart or specimen-based imagery. Movie-style view: Original artistic interpretation. Reconstructions involve uncertainty.
PERIODEarly Jurassic[1]
DIETCarnivoreEvidence and uncertainty in the dossier
TOTAL LENGTH4.2–4.2 mEstimate scope matters
FOSSILS FOUNDArgentina[1]
MEET THE ANIMAL
Meet Piatnitzkysaurus
Piatnitzkysaurus was a meat-eating dinosaur from what is now Argentina. The museum directory gives a useful length reference of about 4.2 meters, but that number is an educational estimate rather than a maximum measured from one complete animal. It helps convey scale while leaving room for the incomplete fossils and the uncertainties of reconstructing a whole body. [D3]
New studies place its fossil-bearing beds in the Early Jurassic. Dates from the relevant layers fall around 178.8 to 178.1 million years ago. The animal is known from two incomplete specimens, including parts of the head and backbone. Scientists inspect which bones really belong together instead of assuming every nearby tooth or fragment came from the same dinosaur. [D1]
Its arms were more substantial than the tiny arms familiar from some famous predators. The preserved upper arm and forearm bones help establish that difference, although the hands still need careful restoration. Recent researchers also compare small details of the hip and limbs with other early theropods. These comparisons help identify the animal without turning an incomplete skeleton into a copy of Allosaurus. [D2]
PREHISTORIC ANIMAL DOSSIER
A life in profile.
The animal, the evidence, and the questions still open.
Modern redescriptions distinguish its forelimbs and vertebrae from those of better-known theropods. [D2]
Profile scope: Genus — Piatnitzkysaurus floresi; incomplete specimens PVL 4073 and MACN-Pv CH 895. [D1]
- Time
- Early Jurassic
- Fossil locations in this exhibit
- Argentina
How to read the evidence
Source supported identifies a description documented by the cited source. Inferred marks a reconstruction or functional estimate. Debated marks competing interpretations. Not established means the sources reviewed for this dossier do not support a firm conclusion; it does not mean a behavior never occurred.
A size reference is an estimate, not a population range. Nesting evidence does not by itself establish courtship, mate choice, or lifelong pairing.
Body mass
Not establishedNot established here
The reviewed directory does not provide a comparable maturity-qualified mass. [D3]
Diet and feeding
InferredAnimal feeding inferred
The museum identifies a carnivore; no preserved meal or specific hunting strategy is adopted. [D3]
Habitat and setting
Source supportedPatagonian terrestrial basin
The Cañadón Asfalto fossils come from a continental basin; type-bearing beds are Toarcian Early Jurassic, about 178.8–178.1 million years old. [D1]
Movement
InferredBipedal reconstruction
The pelvis and hindlimbs support two-legged movement; reconstructed movement is not a measured speed. [D2]
Recognizable anatomy
Source supportedRelatively long forelimbs
Humerus and ulna support functional arms. Incomplete hands require comparative restoration; they are not tyrannosaur-style stubs. [D2]
Reproduction & life together
Reproduction and nesting
Not establishedNot established here
The reviewed axial material provides no assigned nest, egg or embryo. [D1]
Mating and courtship
Not establishedNot established here
The reviewed appendicular fossils do not reveal mating signals. [D2]
Social behavior
Not establishedNot established here
Association with other dinosaurs in a bonebed does not demonstrate cooperative hunting. [D1]
Dossier research & sources
Sources and inspection notes for the claims in this profile.
- The axial osteology of the theropod dinosaur Piatnitzkysaurus floresi from the Early Jurassic of Patagonia, Argentina (Pradelli et al., 2026)Royal Society Open Science 13:251876 · Accessed 2026-10-06Full original article retained and axial/systematic/locality/dating passages inspected. PVL 4073 and MACN-Pv CH 895; Cañadón Asfalto type beds dated 178.766±0.092–178.070±0.21 Ma, Toarcian. Isolated teeth in type association cannot automatically be referred to this dinosaur. · Inspected: page
- The appendicular osteology of the Early Jurassic theropod Piatnitzkysaurus floresi and its implications on the morphological disparity of non-coelurosaurian tetanurans (Pradelli, Pol and Ezcurra, 2025)Zoological Journal of the Linnean Society 203:zlae176 · Accessed 2026-10-06Original indexed systematic, appendicular descriptions and comparative conclusions inspected; associated full treatment also inspected in Plazi. Functional, relatively long forelimbs; hands incomplete. Character differences from Condorraptor are retained, not presented as settled synonymy. · Inspected: excerpt
- Piatnitzkysaurus dinosaur directoryNatural History Museum, London · Accessed 2026-10-06Directory inspected for 4.2 m reference, Argentina, carnivore label and floresi spelling. Its Late Jurassic age and historical family label are superseded by the 2025/2026 original revisions. · Inspected: page
THE STORY IN THE FOSSILS
Evidence behind Piatnitzkysaurus
Recent dating puts the type beds in the Early Jurassic, updating older educational age assignments. [1]
The length displayed here is a museum reference rather than a measured species maximum. [3]
A note on scale and time
The dossier identifies the scope of each reference estimate. A mount, an individual fossil and a species-wide adult range are different measurements. Comparison metrics remain unavailable where adult scope has not been established. Unknown does not mean zero.
Sources & editorial notes
Sources support the stated claims and scopes. Refer to the evidence notes for uncertainty.
- The axial osteology of the theropod dinosaur Piatnitzkysaurus floresi from the Early Jurassic of Patagonia, Argentina (Pradelli et al., 2026)Royal Society Open Science 13:251876 · Accessed 2026-10-06Full original article retained and axial/systematic/locality/dating passages inspected. PVL 4073 and MACN-Pv CH 895; Cañadón Asfalto type beds dated 178.766±0.092–178.070±0.21 Ma, Toarcian. Isolated teeth in type association cannot automatically be referred to this dinosaur. · Inspected: page
- The appendicular osteology of the Early Jurassic theropod Piatnitzkysaurus floresi and its implications on the morphological disparity of non-coelurosaurian tetanurans (Pradelli, Pol and Ezcurra, 2025)Zoological Journal of the Linnean Society 203:zlae176 · Accessed 2026-10-06Original indexed systematic, appendicular descriptions and comparative conclusions inspected; associated full treatment also inspected in Plazi. Functional, relatively long forelimbs; hands incomplete. Character differences from Condorraptor are retained, not presented as settled synonymy. · Inspected: excerpt
- Piatnitzkysaurus dinosaur directoryNatural History Museum, London · Accessed 2026-10-06Directory inspected for 4.2 m reference, Argentina, carnivore label and floresi spelling. Its Late Jurassic age and historical family label are superseded by the 2025/2026 original revisions. · Inspected: page
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