Cretaceous
Hypsilophodon
Hypsilophodon foxii
The catalogue presents Hypsilophodon as a herbivore member of Hypsilophodontidae that lived during the Cretaceous, between 125.8–121.4 Ma. Its estimated range is 1.5–2.3 m in length and 20–70 kg in mass, giving a practical sense of scale. Reference material comes from Hypsilophodon Bed, Wessex Formation, Isle of Wight, England. Size and mass are approximations and may change with new fossils or methods.
Evidence-backed summary
For Hypsilophodon, the PBDB records the taxonomic attribution as Huxley (1870).
The PBDB places it in Hypsilophodontidae, and the catalogue record assigns it to the family Hypsilophodontidae.
- PBDB · taxon.parent
- Hypsilophodontidae
In the PBDB record, the reported stratigraphic range runs from the Kimmeridgian to the Aptian.
The PBDB catalogues 3 occurrences, with material from the Wessex Formation (2). Provenance: United Kingdom.
The catalogue records the holotype as NHMUK PV R197 and the type locality as “Hypsilophodon Bed, Wessex Formation, Isle of Wight, England”.
- NHMUK PV R197
- Hypsilophodon Bed, Wessex Formation, Isle of Wight, England
The catalogue's reference measurements are 1.5–2.3 m in length and 20–70 kg in mass — estimates, which vary with specimen and method.
- 1.5-2.3 m
- 20-70 kg
The record gathers 111 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
- 1.5–2.3 m
- Weight
- 20–70 kg
- Period
- Cretaceous
- Time range
- 125.8–121.4 Ma
Discovery Information
- First Discovery
- 1869
- Described by
- Thomas Henry Huxley
Taxonomic Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Ornithischia
- Family
- Hypsilophodontidae
- Genus
- Hypsilophodon
- Species
- H. foxii
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
- NHMUK PV R197
- Type locality
- Hypsilophodon Bed, Wessex Formation, Isle of Wight, England