LIST OF THE RICHARDS SPUR (FORT SILL) TETRAPOD PALEOFAUNA
Stratigraphic chart of the lower Permian (partial)
Content updated April 10, 2006
DIMETRODON
Synapsida-Eupelycosauria-Sphenacodontidae
Above: picture of the same Dimetrodon upper part of neural spine in frontal view, it is visible the groove(G), presumably carrying a bloodvessel. This groove is present both frontally and posteriorly, and it gives to the spine, in cross section, an "8" shape. From Ryan Sandstone, Wellington Formation, near Waurika - Jefferson Co. Oklahoma. Lower Permian.
Abbreviations: G, groove.