Dinosaur fossils & 3D skeletons › Allosaurus
Allosaurus Fossil & 3D Skeleton
Allosaurus fragilis
- Age
- Jurassic, about 148.9 million years ago
- Found in
- United States
- Length
- 7.1 m
- Height
- 2.2 m
- Group
- Close relative of Allosaurus
How this 3D skeleton was made
This 3D model is a reconstruction. Most bone shapes (190 of 250) are borrowed from close relatives and fitted to this species' size and body proportions. The bone shapes are not the actual shapes of this species' fossils. 27 bones were shaped from photos or figures of this species' own fossils. 33 are estimated.
From this species 27Borrowed from relatives 190Estimated 33
Bones known from fossils
250 of 250 bones are known from fossils.
Known 250Filled in 0No record 0
Tap a bone on the 3D page to see where each bone shape came from.
Sources
- 3D Skeleton: Created on this site. Bone shapes were traced from plate photos and text illustration outlines in Gilmore 1920 (Bulletin of the United States National Museum 110, public domain; named Antrodemus valens at the time), and sized according to the measurement tables in the same book (complete specimen USNM 4734). Cervical vertebrae were made into a single part from a drawing showing them articulated. Shapes of manual and pedal digits, ribs, chevrons, etc., were estimated (revealed when touching bones). Pose is a general theropod standing posture (angles determined by this site) Pose (2026-09-30): Referenced the asymmetrical stride in Pacheco et al. 2019 PeerJ Fig. 1H (Gnathovorax). Allosaurus stride length, 8° forward trunk tilt, turning the neck 20° to the right and 12° downward, and lateral tail swing are estimates for display purposes. They are not measured ranges of motion or speeds for this species. It depicts a mid-stride transition with the left foot supporting and the right hindlimb swung an additional 10° backward at the hip joint (estimated). Distinguishing between the supporting and swinging leg is an exhibition estimate, not a reproduction of walking speed or running ability. Instead of a walking diagram of this species itself, bone orientations from a related species with the same walking style were applied.
- Bones found: Multiple specimens with nearly complete skeletons have been found for this species (such as USNM 4734 in Gilmore 1920).
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