Brazilian paleontologist Alexander Kellner shows the fossils and a model of the newly-discovered prehistoric pterosaur to journalists during its presentation at Rio's Federal University Museum in Rio de Janeiro, March 20, 2013. According to Brazilian scientists, the specimen is referred to as Tropeognathus cf. T. mesembrinus, and it is the largest known pterosaur fossils recovered from Gondwana, the name given to the more southerly of the two supercontinents which were part of the Pangaea supercontinent in the past. (Photo by Ricardo Moraes/Reuters)
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