Modesto, S. P. 1994 The Lower Permian synapsid <em>Glaucosaurus</em> from Texas Palaeontology 37 51-60 Seymouria Captorhinus Caseidae Eothyris Mycterosaurus Ophiacodontidae Haptodus Glaucosaurus Ianthasaurus Edaphosaurus Osteology Maximum Parsimony Based on reanalysis of the original matrix. Modesto_1994a