(Petrolacosaurus,(Hovasaurus,(Claudiosaurus,(Thadeosaurus,(Hupehsuchus,(Cartorhynchus,((Chaohusaurus_chaoxianensis,(Chaohusaurus_geishanensis,Chaohusaurus_zhangjiawanensis)),((Parvinatator,(Utatsusaurus,(Grippia,Gulosaurus))),((((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,(Ichthyosaurus,(Stenopterygius,(Maiaspondylus,(Arthropterygius,(Platypterygius,(((Sveltonectes,(Aegirosaurus,Brachypterygius)),(Acamptonectes,Ophthalmosaurus)),(Athabascasaurus,Caypullisaurus)))))))),(Temnodontosaurus,((Leptonectes_moorei,(Leptonectes_tenuirostris,Leptonectes_solei)),(Excalibosaurus,Eurhinosaurus))))))))))),(Xinminosaurus,(Cymbospondylus_petrinus,(Cymbospondylus_buchseri,Cymbospondylus_nichollsi))))))))))));