Researchers in China report fossils from about 237 million years ago that they reconstruct as *Gerrothorax*—an armoured, flat-bodied amphibian previously known from Late Triassic deposits. Both outlets say the work is based on well-preserved remains that allow detailed reconstruction.
The discovery is presented as evidence that at least one amphibian species lived fully in the sea. One account links the find to deep-sea sediments and describes how geochemical analysis (strontium isotope measurements) is used to compare the fossil’s chemistry with seawater signatures from the Late Triassic. The shared emphasis is on combining anatomical reconstruction with environmental and geochemical indicators to argue for an entirely marine lifestyle, rather than a shoreline or occasional marine presence.
