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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

RICHARDS SPUR UNIDENTIFIED 

SPHENACODONTID

Synapsida-Eupelycosauria-Sphenacodontidae

The presence of sphenacodontids at Richards Spur is not reported in the literature, but is difficult to explain the morphology of these fossils (the tooth in particular) in other ways.

1) Richards Spur unidentified sphenacodontid: tooth

2) Richard Spur unidentified sphenacodontid: cervical vertebra

3) Richards Spur unidentified sphenacodontid: dorsal vertebra:

             I) (lateral view)

            II) (anterior,posterior  view)

           III) (ventral, dorsal view)