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Earth’s first fully marine amphibian prowled the seafloor
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Earth’s first fully marine amphibian prowled the seafloor

Nearly 237 million years ago, a chunky amphibian prowled the ocean that covered what is now southern China. Fossils of Gerrothorax maritimus make it the first fully marine amphibian known from the fossil record. Its flattened, three-foot-long body was covered in bony armor that may have protected it from predators. Researchers think it waited on the seafloor and sucked in passing prey, much like some carpet sharks do today.
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