Rieppel, O. 2000 <em>Paraplacodus</em> and the phylogeny of the Placodontia (Reptilia: Sauropterygia) Zoological Journal of the Linnean Society 130 635-659 Pachypleurosaurs Simosaurus Nothosaurus Placodus Paraplacodus Cyamodus Henodus Macroplacus Placochelys Protenodontosaurus Psephoderma Osteology Maximum Parsimony Based on reanalysis of the original matrix. Rieppel_2000a