Liu, J. Rubidge, B. Li, J.-L. 2009 New basal synapsid supports Laurasian origin for therapsids Acta Palaeontologica Polonica 54 393-400 Haptodus Dimetrodon Tetraceratops Raranimus Biarmosuchus Hipposaurus Herpetoskylax Lycaenodon Lemurosaurus Proburnetia Burnetia Syodon Titanophoneus Stenocybus Styracocephalus Jonkeria Estemmenosuchus Biseridens Patranomodon Suminia Gorgonops Lycaenops Cyonosaurus Osteology Maximum Parsimony Based on reanalysis of the original matrix. Liu_etal_2009a