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