Protohadros

Say it like this: “PROH-to-HAD-ros”

Protohadros byrdi

Protohadros ate plants and walked on two or four legs. It lived in the Late Cretaceous. Bones have been found in the United States.

Quiz me on Protohadros

When: Late Cretaceous (Cenomanian) · roughly 100.5 to 93.9 million years ago
Named in: 1998 · Head, J. J.
Hip height: Not established
Length: 6 m · 20 ft
Weight: Not established
Found in: the United States · Lewisville
Food and walking: Herbivore · Two or four legs
Kind: beaked plant-eater · Ornithopod
Family branch: Hadrosauromorpha

The story in short

Protohadros was formally named in 1998 by J. J. Head. The name means “first hadrosaur.”

It lived in the Late Cretaceous (Cenomanian), roughly 100.5 to 93.9 million years ago. Finds come from the United States, including the Lewisville Formation. It was a herbivore and could move on two or four legs.

Published estimates put Protohadros at a length near 6 m.

On the family tree it sits in Hadrosauromorpha, among the ornithopod dinosaurs.

Close relatives

Bactrosaurus

Bactrosaurus johnsoni

Late Cretaceous (Campanian) · roughly 83.6 to 72.2 million years ago

Claosaurus

Claosaurus agilis

Late Cretaceous (Coniacian · Santonian) · roughly 89.8 to 83.6 million years ago

Eolambia

Eolambia caroljonesa

Late Cretaceous (Cenomanian) · roughly 100.5 to 93.9 million years ago