Kissel, R. A. Reisz, R. R. 2004 Synapsid fauna of the Upper Pennsylvanian Rock Lake Shale near Garnett, Kansas and the diversity pattern of early amniotes 409-428 Recent Advances in the Origin and Early Radiation of Vertebrates Verlag Dr. Friedrich Pfeil Munchen Arratia, G. Wilson, M. V. H. Cloutier, R. Varanopseidae Ophiacodontidae Edaphosauridae Haptodus Palaeohatteria Pantelosaurus Cutleria Sphenacodon Dimetrodon Biarmosuchus Dinocephalia Ianthodon Osteology Maximum Parsimony Based on reanalysis of the original matrix. Kissel_et_Reisz_2004a