Cretaceous
Ornithomimus
Ornithomimus velox
The catalogue presents Ornithomimus as a omnivore member of Ornithomimidae that lived during the Cretaceous, between 76.5–72.0 Ma. Its estimated range is 3.8–4.5 m in length and 150–200 kg in mass, giving a practical sense of scale. Reference material comes from Denver Formation, Colorado, USA. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Ornithomimus, the PBDB records the taxonomic attribution as Marsh (1890).
The PBDB places it in Ornithomimidae, and the catalogue record assigns it to the family Ornithomimidae.
- PBDB · taxon.parent
- Ornithomimidae
In the PBDB record, the reported stratigraphic range runs from the Campanian to the Maastrichtian.
The PBDB catalogues 5 occurrences, with material from the Denver Formation (4) and from the Ferris Formation (1). Provenance: United States.
The catalogue records the holotype as YPM 548 and the type locality as “Denver Formation, Colorado, USA”.
- YPM 548
- Denver Formation, Colorado, USA
The catalogue's reference measurements are 3.8–4.5 m in length and 150–200 kg in mass — estimates, which vary with specimen and method.
- 3.8-4.5 m
- 150-200 kg
The record gathers 108 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
- 3.8–4.5 m
- Weight
- 150–200 kg
- Period
- Cretaceous
- Time range
- 76.5–72.0 Ma
Discovery Information
- First Discovery
- 1890
- Described by
- Othniel Charles Marsh
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Saurischia
- Family
- Ornithomimidae
- Genus
- Ornithomimus
- Species
- O. velox
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
- YPM 542
- Type locality
- Denver Formation, Colorado, USA