Jurassic
Haplocanthosaurus
Haplocanthosaurus priscus
The catalogue presents Haplocanthosaurus as a herbivore member of Haplocanthosauridae that lived during the Jurassic, between 155.0–150.0 Ma. Its estimated range is 14.0–21.5 m in length and 12.0–25.0 t in mass, giving a practical sense of scale. Reference material comes from Morrison Formation, Colorado, USA. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Haplocanthosaurus, the PBDB records the taxonomic attribution as Hatcher (1903).
The PBDB places it in Diplodocoidea, and the catalogue record assigns it to the family Haplocanthosauridae.
- PBDB · taxon.parent
- Haplocanthosauridae
In the PBDB record, the reported stratigraphic range runs from the Kimmeridgian to the Tithonian.
The PBDB catalogues 2 occurrences, with material from the Morrison Formation (2). Provenance: United States.
The catalogue records the holotype as CM 572 and the type locality as “Morrison Formation, Colorado, USA”.
- CM 572
- Morrison Formation, Colorado, USA
The catalogue's reference measurements are 14.0–21.5 m in length and 12.0–25.0 t in mass — estimates, which vary with specimen and method.
- 14.0-21.5 m
- 12.0-25.0 tons
The record gathers 74 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
- 14.0–21.5 m
- Weight
- 12.0–25.0 t
- Period
- Jurassic
- Time range
- 155.0–150.0 Ma
Discovery Information
- First Discovery
- 1903
- Described by
- Hatcher
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Saurischia
- Family
- Haplocanthosauridae
- Genus
- Haplocanthosaurus
- Species
- H. priscus
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
- CM 572
- Type locality
- Morrison Formation, Colorado, USA