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