Istiorachis

DV-1278 · type species Istiorachis macarthurae

Lived: 133 to 121 million years ago, Early Cretaceous
Diet: Herbivore
Group: Ornithopods
Found in: United Kingdom
Named by: Lockwood et al. 2025

Field notes

About Istiorachis

Istiorachis was a plant-eating ornithopod that lived in the Early Cretaceous, 133 to 121 million years ago.

The Paleobiology Database lists 1 find of Istiorachis, from United Kingdom. Its fossils come from the Wessex Formation. It was named by Lockwood et al. in 2025.

The evidence

Where its fossils were found

Today

1 find

125 million years ago

Map: C. R. Scotese, PALEOMAP

Lived alongside

Found in the same rock formations.

Close relatives

Other members of Styracosterna.

Sources: Paleobiology Database, WikidataNamed in: J. A. F. Lockwood, D. M. Martill, and S. C. R. Maidment. 2025. The origins of neural spine elongation in iguanodontian dinosaurs and the osteology of a new sail‐back styracosternan (Dinosauria, Ornithischia) from the Lower Cretaceous Wealden Group of England. Papers in Palaeontology 11(4):e70034:1-38