Porosteognathus is an extinct genus of therocephalian therapsids. Remains have been found at Isheevo in Russia (Republic of Tatarstan).Michael J. Benton, Mikhail A. Shishkin, David M. Unwin, and Evgenii N. Kurochkin (2003): The Age of Dinosaurs in Russia and Mongolia, Cambridge University Press It is known from the Middle Permian.
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