Sander, P. M. 2000 Ichthyosauria: their diversity, distribution, and phylogeny Palaontologische Zeitschrift 74 1-35 Ancestor Petrolacosaurus Araeoscelis Grippia Utatsusaurus Besanosaurus Cymbospondylus Mixosaurus Phalarodon Shonisaurus Eurhinosaurus Ichthyosaurus Temno_latyodon Temno_burgundiae Lepto_tenuirostris Stenopterygius Opthalmosaurus Platypterygius Suevoleviathan Osteology Maximum Parsimony Based on reanalysis of the original matrix. Sander_2000a