The cranial anatomy and relationships of the synapsid <em>Varanosaurus</em> (Eupelycosauria: Ophiacodontidae) from the Early Permian of Texas and Oklahoma

Berman, D. S. Reisz, R. R. Bolt, J. R. Scott, D. 1995 The cranial anatomy and relationships of the synapsid <em>Varanosaurus</em> (Eupelycosauria: Ophiacodontidae) from the Early Permian of Texas and Oklahoma Annals of Carnegie Museum 64 99-133 Caseasauria Varanopseidae Archaeothyris Ophiacodon Varanosaurus Edaphosauridae Haplodus Sphenaoodontoidea Osteology Maximum Parsimony Based on reanalysis of the original matrix. Berman_etal_1995a