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ABSTRACT
An undescribed genus and species of pachyosteomorph arthrodire, Squamatognathus steeprockensis gen. et sp. nov., from the Middle Devonian (Eifelian) Elm Point Formation in Manitoba is described. It was found in the LaFarge Quarry at Steep Rock, Manitoba, and is represented by the anterior portion of a large, right inferognathal with a large terminal cusp, similar to inferognathals of the family Dinichthyidae. It has unique sculpture on the lingual surface not reported from any other dinichthyid arthrodire.