Crassigyrinus scoticus (large tadpole) had a streamlined body up to 1.5 meters long and 30 cm wide.
The prehistoric animal legs were small in comparison to his body and probably of little value, this indicates that the Crassigyrinus scoticus was perfectly adapted to aquatic environments and did not venture in land area.
The highlight of the Crassigyrinus scoticus was that he was big and strong jaws, equipped with two rows of sharp teeth.
Studies have shown that this Carboniferous animal had a jaw opening up to 60 ° can easily catch their prey. To this we must add a lot of pressure that made his jaw bite one of the most fearsome of the time.
The jaw opening and the speed and agility that gave it its long body and aerodynamic, suggests that between prey fish came fast movements.
Crassigyrinus had eyes rather large, thereby helping to find prey in dark places or in murky water.
This prehistoric amphibian lived in Europe (fossils have been found mainly in Scotland) during the Carboniferous.