Prehistoric sea amphibian could survive in salt water - thanks to its thick skin

Fossils of the Gerrothorax maritimus, the first known saltwater amphibian, were discovered in China, indicating it thrived in ocean environments. Unlike modern amphibians, which struggle in saltwater, this prehistoric species had a thick skin that prevented dehydration. The fossils, dating back 273 million years, were found in ocean sediment, suggesting the creature lived on the seafloor, preying on fish and other marine life. Its unique body structure resembled that of a wobbegong shark, and it likely managed salt through its gills, allowing it to survive in salty conditions for millions of years.