Cretaceous
Bactrosaurus
Bactrosaurus johnsoni
The catalogue presents Bactrosaurus as a herbivore member of Hadrosauridae that lived during the Cretaceous, between 90.0–80.0 Ma. Its estimated range is 5.0–6.0 m in length and 1.0–1.5 t in mass, giving a practical sense of scale. Reference material comes from Iren Dabasu Formation, Inner Mongolia, China. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Bactrosaurus, the PBDB records the taxonomic attribution as Gilmore (1933).
The PBDB places it in Hadrosauroidea, and the catalogue record assigns it to the family Hadrosauridae.
- PBDB · taxon.parent
- Hadrosauridae
In the PBDB record, the reported stratigraphic range runs from the Turonian to the Campanian.
The PBDB catalogues 4 occurrences, with material from the Iren Dabasu Formation (3) and from the Zouyun Formation (1). Provenance: China.
The catalogue records the holotype as AMNH 6553 and the type locality as “Iren Dabasu Formation, Inner Mongolia, China”.
- AMNH 6553
- Iren Dabasu Formation, Inner Mongolia, China
The catalogue's reference measurements are 5.0–6.0 m in length and 1.0–1.5 t in mass — estimates, which vary with specimen and method.
- 5.0-6.0 m
- 1.0-1.5 tons
The record gathers 60 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
- 5.0–6.0 m
- Weight
- 1.0–1.5 t
- Period
- Cretaceous
- Time range
- 90.0–80.0 Ma
Discovery Information
- First Discovery
- 1933
- Described by
- Charles Gilmore
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Ornithischia
- Family
- Hadrosauridae
- Genus
- Bactrosaurus
- Species
- B. johnsoni
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
- AMNH 6553
- Type locality
- Iren Dabasu Formation, Inner Mongolia, China