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1551 tropeognathus peter montgomery
Tropeognathus
 is a genus of large pterosaurs from the late Cretaceous Period of South America. It was a member of the Ornithocheiridae (alternately Anhangueridae), a group of pterosaurs known for their keel-tipped snouts, and was closely related to species of the genus Anhanguera. The type and only species is Tropeognathus mesembrinus; a second species, Tropeognathus robustus, is now considered to belong to Anhanguera.
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