| Diet | Carnivore |
| Height | 1.5m |
| Length | 3m |
| Weight | 150 kg |
| Environment | Land |
| Era | Triassic |
| Period | Triassic |
| Type | Other |
| Location | Canada |
Although once classified as a dinosaur, Bathygnathus is now known to be a pelycosaur-grade synapsid - an ancient reptilian group that lived long before the dinosaurs evolved. This fascinating creature lived approximately 270 million years ago during the Early Middle Permian period in what is now Prince Edward Island, Canada. Bathygnathus is actually now considered to be a species of Dimetrodon, one of the most recognisable prehistoric reptiles with its distinctive sail-like back fin.
As a member of the synapsid group, Bathygnathus was more closely related to modern mammals than to dinosaurs or other reptiles. This carnivorous predator would have been an impressive sight, likely measuring around 3 metres in length and standing about 1.5 metres tall. Like other Dimetrodon species, it probably had the characteristic tall neural spines along its back that supported a large sail-like structure, though this cannot be confirmed from the single jaw bone that has been discovered.
The creature's powerful jaws contained sharp, pointed teeth perfectly adapted for catching and consuming fish, amphibians, and smaller reptiles. As an active predator, Bathygnathus would have been one of the apex predators of its time, using its impressive size and fearsome bite to dominate the ancient ecosystems of early Permian Canada.
The discovery of Bathygnathus holds special historical significance as it was originally thought to be the first dinosaur found in Canada and only the second discovered in all of North America, highlighting the evolving nature of palaeontological understanding over time.
Bathygnathus possessed a robust upper jaw bone with sharp, conical teeth designed for gripping prey. As a Dimetrodon species, it likely had the characteristic tall sail on its back supported by elongated neural spines, though this cannot be confirmed from the fragmentary remains.
As a carnivorous predator, Bathygnathus would have actively hunted fish, amphibians, and smaller reptiles in the ancient waterways and forests of Permian Canada. Like other Dimetrodon species, it may have used its sail for temperature regulation, catching morning sun to warm up quickly for hunting.
| Phylum | Chordata |
| Class | Osteichthyes |
| Order | Cotylosauria |
| Family | Sphenacodontidae |
| Genus | Bathygnathus |
Bathygnathus was first described by Joseph Leidy in 1854. The original fossils were discovered at Spring Brook, New London area, Prince Edward Island, Canada.
