Cretaceous
Segnosaurus
Segnosaurus galbinensis
The catalogue presents Segnosaurus as a herbivore member of Therizinosauridae that lived during the Cretaceous, between 99.0–93.0 Ma. Its estimated range is 4.0–7.0 m in length and 1.3 t in mass, giving a practical sense of scale. Reference material comes from Bayan Shireh Formation, Mongolia. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Segnosaurus, the PBDB records the taxonomic attribution as Perle (1979).
The PBDB places it in Therizinosauridae, and the catalogue record assigns it to the family Therizinosauridae.
- PBDB · taxon.parent
- Therizinosauridae
In the PBDB record, the reported stratigraphic range runs from the Cenomanian to the Santonian.
The PBDB catalogues 3 occurrences, with material from the Baynshire Formation (3). Provenance: Mongolia.
The catalogue records the holotype as GIN 100/80 and the type locality as “Bayan Shireh Formation, Mongolia”.
- GIN 100/80
- Bayan Shireh Formation, Mongolia
The catalogue's reference measurements are 4.0–7.0 m in length and 1.3 t in mass — estimates, which vary with specimen and method.
- 4.0-7.0 m
- 1.3 tons
The record gathers 28 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
- 4.0–7.0 m
- Weight
- 1.3 t
- Period
- Cretaceous
- Time range
- 99.0–93.0 Ma
Discovery Information
- First Discovery
- 1979
- Described by
- Altangerel Perle
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Saurischia
- Family
- Therizinosauridae
- Genus
- Segnosaurus
- Species
- S. galbinensis
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
- GIN 100/80
- Type locality
- Bayan Shireh Formation, Mongolia