Reisz, R. R. Godfrey, S. J. Scott, D. 2009 <em>Eothyris</em> and <em>Oedaleops</em>: do these Early Permian synapsids from Texas and New Mexico form a clade? Journal of Vertebrate Paleontology 29 39-47 Diadectomorpha Reptilia Cotylorhynchus Casea_broili Casea_rutena Eothyris Oedaleops Archaeothyris Ophiacodon Mycterosaurus Mesenosaurus Varanops Archaeovenator Osteology Maximum Parsimony Based on reanalysis of the original matrix. Reisz_etal_2009a