Temporal range: Permian (Roadian), 270Ma
|Head of Bathygnathus borealis, very speculative restoration.|
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, in Spring Brook in the New London area 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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