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LIST OF THE RICHARDS SPUR (FORT SILL) TETRAPOD PALEOFAUNA Stratigraphic chart of the lower Permian (partial) Content updated April 10, 2006
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SYNAPSIDA
Synapsida is a group of amniotes characterized by the presence of a lower temporal fenestration and narrow neural arches, these two features are present also in other amniotes, but not joined together. There is one exception, the ophiacodontid Varanosaurus that has swollen neural arches, but for that case we have to consider other characteristics that are typical of ophiacodontids and sphenacodontids, among them, the retaining of the plesiomorphic two coronoids and two pedal centralia.
Oromycter dolesorum and a possible new Fort Sill caseasaur Richards Spur Varanopids (Varanopseids) Richards Spur Unidentified Sphenacodontid |