Mastodonsauridae

Mastodonsauridae is an extinct family of large, crocodile-like temnospondyl amphibians. These amphibians were prominent in the Triassic period, particularly during the Middle and Late Triassic epochs. They are characterized by their broad, flattened skulls, long bodies, and powerful limbs, adaptations that suggest a semi-aquatic lifestyle. Mastodonsaurids were among the largest temnospondyls, with some species reaching lengths of up to 6 meters (20 feet). Their diet likely consisted of fish and other aquatic vertebrates, though larger species might have also preyed on terrestrial animals near the water's edge.

The distribution of mastodonsaurids was widespread, with fossils found across various continents, indicating their successful adaptation to diverse environments. Their prevalence during the Triassic suggests they played a significant role in freshwater ecosystems before being eventually outcompeted by the diversifying archosaurs, the group that includes dinosaurs and crocodiles, which ultimately dominated many terrestrial and aquatic niches. The decline of mastodonsaurids is often linked to climatic changes and increased competition during the Late Triassic. Their fossil record provides valuable insights into the amphibian fauna and the ecological landscape of the Triassic world.