Stratigraphic chart of the lower Permian (partial)
Content updated October 16, 2005
STEREOSTERNUM TUMIDUM
(Amniote inc.sedis? Basal Parareptile?
Mesosauridae
Above: pictures of the snout of the same Stereosternum skull.
Abbreviations: d, dentary; j, jugal; l, lacrimal; m, maxilla; pm, premaxilla;