Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
STEREOSTERNUM TUMIDUM
(Amniote inc.sedis? Basal Parareptile?
Mesosauridae
Above: pictures of the temporal region, of the same Stereosternum skull.
Abbreviations: an, angular; ax, axis; d, dentary; j, jugal; l, lacrimal; p, parietal; pt, pterygoid; q, quadrate; qj, quadratojugal; s, supraoccipital; sa, surangular; sq, squamose; st, supratemporal.