Eogyrinus

Eogyrinus is an extinct genus of large predatory amphibian belonging to the order Anthracosauria. It lived during the Late Carboniferous period, approximately 300 million years ago, in what is now the United Kingdom. The name Eogyrinus means "dawn hunter."

The only known species, Eogyrinus attheyi, was a formidable predator. Estimates suggest it could grow up to 4 to 5 meters (13 to 16 feet) in length, making it one of the largest terrestrial vertebrates of its time. Its body was elongated and robust, with a long, powerful tail that likely aided in swimming. Eogyrinus possessed a large skull with sharp teeth, indicative of a carnivorous diet. Its limbs were strong, suggesting it was capable of moving on land, though it likely spent a significant amount of time in or near water, ambushing prey such as fish and smaller tetrapods.

Fossil remains of Eogyrinus have been found in coal deposits, which preserve ancient swamp environments. The discovery of its fossils provides valuable insights into the evolution of early tetrapods and the ecosystems of the Carboniferous period. Eogyrinus represents an important step in the transition from aquatic to terrestrial life for vertebrates, showcasing a successful adaptation to both environments.