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295-Million-Year-Old Frog Relative Immaculately Preserved in Fossil

November 13 , 2016:

by Laura Geggel

Long before dinosaurs walked the Earth, a teeny-tiny amphibian swam around a lake surrounded by large mountain ranges, using its minuscule jaws to nab insects and other small prey, a new study finds.

The amphibian was still in its larval stage when it died (in frogs, this creature's distant relatives, the larval phase is known as the tadpole stage), and it expired on its back, belly-up, said study lead researcher Johan Gren, a doctoral student of geology at Lund University in Sweden.

The upper half of the body of this 295-million-year-old amphibian was exceptionally well preserved, the researchers found. For instance, most of the skull and braincase are present, as are several vertebrae, one of its front limbs, part of its lower jaw and some of its soft tissues, including a blackish film within its left eye socket, Gren said.

The teeny creature, just 1.5 inches (4 centimeters) long, is a temnospondyl, a group of early four-legged amphibians that are now extinct, and ranged in size from tiny to giant, Gren said. Had it lived to adulthood, the newly identified temnospondyl "could have grown to tens of centimeters," or maybe 8 to 12 inches, he noted.

Researchers discovered the fossil about 15 years ago in the Saar-Nahe Basin, located in southwestern Germany. The region is known for its many fossils; scientists also have found invertebrates, cartilaginous and bony fishes, and other amphibians in the area, which was once filled with numerous lakes that rippled between two mountain chains, Gren said.

Though tiny, the temnospondyl got star treatment: High-powered microscopes revealed a preserved layer of soft tissues outlining the amphibian's body, and computed tomography (CT) provided the scientists with a 3D image of the fossil, Gren said.

Gren and his adviser, Johan Lindgren, a senior lecturer of lithosphere and biosphere science at Lund University, plan to continue to study the "early frog relative," Gren said. He presented the unpublished findings Wednesday (Oct. 26) here at the 2016 meeting of the Society of Vertebrate Paleontology.



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