Chen, X.-H. Sander, P. M. Cheng, L. Wang, X.-F. 2013 A new Triassic primitive ichthyosaur from Yunnan, South China Acta Geologica Sinica 87 672-677 Petrolacosaurus Thadeosaurus Claudiosaurus Hovasaurus Hupehsuchus Utatsusaurus Grippia Parvinatator Chaohusaurus Cymbospondylus_petrinus Cymbospondylus_buchseri Mixosaurus_cornalianus Mixosaurus_atavus Mixosaurus_nordenskioeldii Besanosaurus Shastasaurus Shonisaurus Californosaurus Toretocnemus Hudsonelpidia Macgowanania Suevoleviathan Temnodontosaurus Leptonectes Excalibosaurus Eurhinosaurus Ichthyosaurus Stenopterygius Brachypterygius Opthalmosaurus Caypullisaurus Platypterygius Chaohusaurus_zhangjiawanensis Osteology Maximum Parsimony Based on reanalysis of the original matrix. Chen_etal_2013b