(Petrolacosaurus,(Hovasaurus,(Thadeosaurus,(Claudiosaurus,(Hupehsuchus,((Parvinatator,(Gulosaurus,(Utatsusaurus,Grippia))),(Chaohusaurus,((((Mixosaurus_cornalianus,(Mixosaurus_panxianensis,Mixosaurus_kuhnschnyderi)),(Phalarodus_atavus,(Phalarodus_fraasi,Phalarodus_callawayi))),((Besanosaurus,(Guizhouichthyosaurus,(Callawayia_wolonggangensis,(Shastasaurus,(Guanlingsaurus,(Shonisaurus_popularis,Shonisaurus_sikanniensis)))))),(Californosaurus,(Callawayia_neoscapularis,((Toretocnemus,(Qianichthyosaurus_zhoui,Qianichthyosaurus_xingyiensis)),(Macgowania,(Hudsonelpidia,((Suevoleviathan,(Temnodontosaurus,((Chacaicosaurus,(Malawania,(Leptonectes_moorei,(Leptonectes_tenuirostris,Leptonectes_solei)))),(Excalibosaurus,Eurhinosaurus)))),(Hauffiopteryx,(Ichthyosaurus,(Stenopterygius,(Maiaspondylus,(Leninia,((Aegirosaurus,Ophthalmosaurus_natans),(Mollesaurus,(Arthropterygius,(Sisteronia,(Cryopterygius,((Brachypterygius,(Athabascasaurus,(Sveltonectes,(Ophthalmosaurus_icenicus,(Acamptonectes,Palvennia))))),(Caypullisaurus,(Platypterygius_australis,Platypterygius_americanus))))))))))))))))))))),(Xinminosaurus,(Thalattoarchon,(Cymbospondylus_piscosus,(Cymbospondylus_buchseri,Cymbospondylus_nichollsi))))))))))));