| Diet | Omnivore |
| Height | 0.8m |
| Length | 1.8m |
| Weight | 25 kg |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Pachycephalosaur |
| Location | Mongolia |
Homalocephale was a fascinating pachycephalosaur that lived during the Late Cretaceous period, approximately 72.2 million years ago. This small, bipedal dinosaur inhabited what is now Mongolia, where its fossils were discovered in the famous Nemegt Formation. Despite its relatively modest size of 1.8 metres in length, Homalocephale has captured the attention of palaeontologists since its discovery in 1974.
What made Homalocephale particularly distinctive amongst pachycephalosaurs was its relatively flat skull roof, which contrasts sharply with the prominent domes seen in many of its relatives. This flatter head structure, reflected in its name meaning 'even head', suggests it may have had different social behaviours compared to other bone-headed dinosaurs. The skull was still quite robust and thick, indicating it could withstand some impact, though perhaps not the dramatic head-butting contests associated with more dome-headed species.
As an omnivore, Homalocephale likely fed on a varied diet of plants, seeds, fruits, and possibly small animals or insects. Its teeth were well-suited for processing both plant material and occasional animal protein. This dietary flexibility would have been advantageous in the diverse Late Cretaceous ecosystems of Mongolia, where it shared its habitat with various other dinosaur species including tyrannosaurs, hadrosaurs, and ceratopsians.
For many years, some scientists considered Homalocephale to be the same as another pachycephalosaur called Prenocephale. However, the discovery of juvenile Prenocephale specimens has helped confirm that these were indeed separate genera, each with their own unique characteristics and evolutionary history.
Homalocephale had a notably flatter skull roof compared to other pachycephalosaurs, lacking the prominent dome typical of many bone-headed dinosaurs. Its skull was still thick and robust, with small spikes and nodes around the edges, giving it a distinctive appearance amongst its relatives.
Homalocephale likely lived in small herds or family groups, foraging for food across the Late Cretaceous landscapes of Mongolia. Unlike dome-headed pachycephalosaurs that may have engaged in dramatic head-butting contests, Homalocephale's flatter skull suggests it used different social display behaviours, possibly involving side-to-side head pushing or other forms of competition.
| Phylum | Chordata |
| Class | Ornithischia |
| Genus | Homalocephale |
Homalocephale was first described by Halszka Osmólska and Teresa Maryańska in 1974. The original fossils were discovered at Nemegt Formation, Mongolia.
