(Petrolacosaurus,(Hovasaurus,((Thadeosaurus,Claudiosaurus),(Hupehsuchus,(Utatsusaurus,Parvinatator,Chaohusaurus_zhangjiawanensis,((Grippia,Chaohusaurus),((Cymbospondylus_petrinus,Cymbospondylus_buchseri),((Mixosaurus_cornalianus,(Mixosaurus_atavus,Mixosaurus_nordenskioeldii)),((Besanosaurus,(Shastasaurus,Shonisaurus)),(Toretocnemus,(Californosaurus,(Macgowanania,(Hudsonelpidia,(Suevoleviathan,(Temnodontosaurus,(Leptonectes,Excalibosaurus,Eurhinosaurus),(Stenopterygius,(Ichthyosaurus,(Brachypterygius,(Opthalmosaurus,(Caypullisaurus,Platypterygius))))))))))))))))))));