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 Introduction

LEPOSPONDYLI

EUREPTILIA

SYNAPSIDA

PARAREPTILIA

DIADECTOMORPHA

ANTHRACOSAUROIDEA

TEMNOSPONDYLI

UNIDENTIFIED TETRAPODS

Stratigraphic chart of the lower Permian (partial)

Phylogenetic Relationships

Content updated October 16, 2005

STEREOSTERNUM TUMIDUM

(Amniote inc.sedis? Basal  Parareptile?

Mesosauridae

 Above: picture of Stereosternum complete skull. From Irati Formation - Brasil.