Neenan, J. M. Li, C. Rieppel, O. Scheyer, T. M. 2015 The cranial anatomy of Chinese placodonts and the phylogeny of Placodontia (Diapsida: Sauropterygia) Zoological Journal of the Linnean Society 175 415-428 Ancestor Palatodonta Paraplacodus Placodus_gigas Placodus_inexpectatus Cyamodus_rostratus Cyamodus_hildegardis Cyamodus_kuhnschnyderi Henodus Macroplacus Placochelys Protenodontosaurus Psephoderma Psephochelys Glyphoderma Sinocyamodus Osteology Maximum Parsimony Based on reanalysis of the original matrix. Neenan_etal_2015ab