Cretaceous
Utahraptor
Utahraptor ostrommaysi
The catalogue presents Utahraptor as a carnivore member of Dromaeosauridae that lived during the Cretaceous, between 137.1–132.6 Ma. Its estimated range is 5.0–7.0 m in length and 250–500 kg in mass, giving a practical sense of scale. Reference material comes from Yellow Cat Member, Cedar Mountain Formation, Utah, USA. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Utahraptor, the PBDB records the taxonomic attribution as Kirkland et al. (1993).
The PBDB places it in Eudromaeosauria, and the catalogue record assigns it to the family Dromaeosauridae.
- PBDB · taxon.parent
- Dromaeosauridae
In the PBDB record, the reported stratigraphic range is the Valanginian.
The PBDB catalogues 2 occurrences, with material from the Cedar Mountain Formation (2). Provenance: United States.
The catalogue records the holotype as CEU 184v.86 and the type locality as “Yellow Cat Member, Cedar Mountain Formation, Utah, USA”.
- CEU 184v.86
- Yellow Cat Member, Cedar Mountain Formation, Utah, USA
The catalogue's reference measurements are 5.0–7.0 m in length and 250–500 kg in mass — estimates, which vary with specimen and method.
- 5.0-7.0 m
- 250-500 kg
The record gathers 27 bibliographic references registered in the PBDB, listed below.
Where it lived
Fossil occurrences on today’s map and in the tectonic reconstruction.
Positions reconstructed by PBDB/GPlates, not observed; this is not an exact habitat map.
Artistic 3D reconstruction
There is no approved species-specific 3D model yet. Generic anatomy will not be presented as if it were evidence.
Physical Specifications
- Length
- 5.0–7.0 m
- Weight
- 250–500 kg
- Period
- Cretaceous
- Time range
- 137.1–132.6 Ma
Discovery Information
- First Discovery
- 1991
- Described by
- James Kirkland, Robert Gaston, Donald Burge
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Saurischia
- Family
- Dromaeosauridae
- Genus
- Utahraptor
- Species
- U. ostrommaysi
Data status
Taxonomic name matched to PBDB and checked on 2026-08-08.
Taxonomic linkage does not automatically validate size, mass, behaviour or appearance.
- Type specimen
- CEU 184v.86
- Type locality
- Yellow Cat Member, Cedar Mountain Formation, Utah, USA