Cretaceous
Byronosaurus
Byronosaurus jaffei
The catalogue presents Byronosaurus as a carnivore member of Troodontidae that lived during the Cretaceous, between 80 Ma. Its estimated range is 1.5 m in length and 4 kg in mass, giving a practical sense of scale. Reference material comes from Omnogovi, Mongolia. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Byronosaurus, the PBDB records the taxonomic attribution as Norell et al. (2000).
The PBDB places it in Troodontinae, and the catalogue record assigns it to the family Troodontidae.
- PBDB · taxon.parent
- Troodontidae
In the PBDB record, the reported stratigraphic range is the Campanian.
The PBDB catalogues 2 occurrences, with material from the Djadokhta Formation (2). Provenance: Mongolia.
The catalogue records the holotype as IGM 100/983 and the type locality as “Omnogovi, Mongolia”.
- IGM 100/983
- Omnogovi, Mongolia
The catalogue's reference measurements are 1.5 m in length and 4 kg in mass — estimates, which vary with specimen and method.
- 1.5 m
- 4 kg
The record gathers 26 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
- 1.5 m
- Weight
- 4 kg
- Period
- Cretaceous
- Time range
- 80 Ma
Discovery Information
- First Discovery
- 2000
- Described by
- Mark Norell
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Saurischia
- Family
- Troodontidae
- Genus
- Byronosaurus
- Species
- B. jaffei
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
- IGM 100/983
- Type locality
- Omnogovi, Mongolia