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horned dinosaur
Monoclonius
Say it like this: “mon-o-KLOHN-ee-us”
Monoclonius crassus
Monoclonius ate plants and walked on four legs. It lived in the Late Cretaceous. Bones have been found in the United States.
- When
- Late Cretaceous (Campanian) · roughly 83.6 to 72.2 million years ago
- Named in
- 1876 · Cope, E. D.
- Hip height
- Not established
- Length
- Not established
- Weight
- Not established
- Found in
- the United States · Judith River
- Food and walking
- Herbivore · Four legs
- Kind
- horned dinosaur · Ceratopsian
- Family branch
- Ceratopsidae
The story in short
In 1876, E. D. Cope published the name Monoclonius. The name means “single sprout.”
Fossils referred to Monoclonius date to the Late Cretaceous (Campanian), roughly 83.6 to 72.2 million years ago. Finds come from the United States, including the Judith River Formation. It was a herbivore and walked on four legs.
The fossils of Monoclonius 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