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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

 CAPTORHINUS AGUTI

Eureptilia-Captorhinidae

Above: picture of Captorhinus Aguti isolate basioccipital in ventral view. From  Richards Spur (Dolese Quarry) - Comanche Co. Oklahoma. Lower Permian.