Acrotholus Facts
Pronunciation: ak-ROTH-oh-lus
Name meaning: Highest Dome
| Diet | Herbivore |
| Height | 0.5m |
| Length | 1.5m |
| Weight | 15 kg |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Pachycephalosaur |
| Location | Canada |
Acrotholus was a small pachycephalosaur dinosaur that lived approximately 85.7 million years ago during the Santonian stage of the Late Cretaceous period. This bipedal herbivore roamed the ancient landscapes of what is now Alberta, Canada, and represents one of the earliest known members of the dome-headed dinosaur family with an indisputable cranial dome.
Standing about half a metre tall at the hip and measuring roughly 1.5 metres in length, Acrotholus was characterised by its distinctive dome-shaped skull. This thick, bony dome gave the dinosaur its name, which means 'highest dome'. Like other pachycephalosaurs, it walked on two legs and had a relatively small body compared to many other dinosaur groups of its time.
As a herbivore, Acrotholus fed on the ferns, cycads, and other plants that grew in the warm, humid climate of Late Cretaceous Canada. Its small size and bipedal stance would have allowed it to move quickly through the prehistoric forests and plains, potentially using speed to escape from predators.
The discovery of Acrotholus has provided important insights into the early evolution of pachycephalosaurs and has challenged previous assumptions about the preservation of small-bodied dinosaurs in the fossil record. The skull dome may have been used for head-butting contests between individuals, though the exact nature of such behaviour remains debated among palaeontologists.
What made Acrotholus distinctive?
Acrotholus was distinguished by its thick, dome-shaped skull that was relatively large compared to its small body size. The dinosaur had a bipedal stance with long hind legs and short arms, typical of pachycephalosaurs.
Behaviour
Acrotholus likely lived in herds and may have engaged in head-butting contests using its distinctive skull dome, though the exact methods of contact remain uncertain. Its small size and bipedal build suggest it could move quickly to escape predators in its forest and plain habitats.
Discovery
Acrotholus was first described by David C. Evans and Caleb M. Brown in 2013. The original fossils were discovered at Milk River Formation, Alberta, Canada.
Acrotholus FAQ
What did Acrotholus eat?
Acrotholus was a herbivore that fed on the plants available during the
Late Cretaceous period, including ferns, cycads, conifers, and early flowering plants. Its small size would have allowed it to browse on low-growing vegetation and possibly fruits and seeds.
How big was Acrotholus?
Acrotholus was quite small for a dinosaur, standing about 0.5 metres tall at the hip and measuring approximately 1.5 metres in total length. It weighed roughly 15 kilograms, making it similar in size to a large dog.
When did Acrotholus live?
Acrotholus lived during the
Late Cretaceous period, specifically during the Santonian stage approximately 85.7 million years ago. This makes it one of the earlier members of the pachycephalosaur group.
Where was Acrotholus found?
Acrotholus fossils were discovered in the Milk River Formation in Alberta, Canada. The discovery was made possible when rancher Roy Audet allowed palaeontologists access to his property where the specimen was found.
How do you pronounce Acrotholus?
Acrotholus is pronounced 'ak-ROTH-oh-lus', with the emphasis on the second syllable 'ROTH'.
What does Acrotholus mean?
The name Acrotholus means 'highest dome' in reference to the dinosaur's distinctive thick, dome-shaped skull which was its most prominent feature.
How fast could Acrotholus run?
The exact running speed of Acrotholus is unknown, but its bipedal stance and long hind legs suggest it was capable of quick movement, which would have been useful for escaping predators in its environment.
What type of dinosaur was Acrotholus?
Acrotholus was a pachycephalosaur, a group of herbivorous dinosaurs known for their distinctive dome-shaped skulls. It belonged to the family Pachycephalosauridae and is one of the earliest known members with a clear cranial dome.
Was Acrotholus related to birds?
As an ornithischian dinosaur, Acrotholus was not directly related to modern birds. Birds evolved from theropod dinosaurs, which belonged to the other major group of dinosaurs called saurischians.
How many Acrotholus fossils have been found?
Acrotholus is known primarily from skull material that forms the type specimen. As a relatively recent discovery from 2013, additional specimens may be found in the future, but currently the fossil record for this species is limited.
