Look up · dinosaur 1006 of 1,425
horned dinosaur
Polyonax
Say it like this: “pol-ee-OH-naks”
Polyonax mortuarius
Polyonax ate plants and walked on four legs. It lived in the Late Cretaceous. Bones have been found in the United States.
- When
- Late Cretaceous (Maastrichtian) · roughly 72.2 to 66 million years ago
- Named in
- 1874 · Cope, E. D.
- Hip height
- Not established
- Length
- Not established
- Weight
- Not established
- Found in
- the United States · Laramie
- Food and walking
- Herbivore · Four legs
- Kind
- horned dinosaur · Ceratopsian
- Family branch
- Ceratopsidae
The story in short
The genus Polyonax dates to 1874, the year E. D. Cope described it. The name means “master over many.”
Fossils referred to Polyonax date to the Late Cretaceous (Maastrichtian), roughly 72.2 to 66 million years ago. Finds come from the United States, including the Laramie Formation. It was a herbivore and walked on four legs.
The fossils of Polyonax are too incomplete for a responsible length, hip height, or weight, so those fields are left blank on purpose.
On the family tree it sits in Ceratopsidae, among the horned dinosaurs.
Close relatives
Agathaumas
Agathaumas sylvestris
Late Cretaceous (Maastrichtian) · roughly 72.2 to 66 million years ago
Brachyceratops
Brachyceratops montanensis
Late Cretaceous (Campanian) · roughly 83.6 to 72.2 million years ago
Ceratops
Ceratops montanus
Late Cretaceous (Campanian) · roughly 83.6 to 72.2 million years ago