From Wikipedia, the free encyclopedia
Left maxilla of
Bathygnathus borealis (below) with comparison of
Dimetrodon's skull.
Bathygnathus was a pelycosaur-grade synapsid, a non-dinosaurian amniote which lived during the Permian Period (about 270 Ma). The only specimen of Bathygnathus was discovered on Prince Edward Island during the course of a well excavation, and its significance recognized by the local naturalist Francis Bain. It was originally described by Leidy in 1855 as the lower jaw of a dinosaur. The specimen is now known to represent the upper jaw (maxilla) of a sphenacodontid synapsid.
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