(Petrolacosaurus,((Utatsusaurus,Parvinatator),(Xinminosaurus,(Grippia,(Chaohusaurus,(Cymbospondylus,((Mixosaurus,Phalarodon),((Besanosaurus,(Shonisaurus,(Shastasaurus,(Callawayia,Guizhouichthyosaurus)))),(Toretocnemus,(Qianichthyosaurus,(Californosaurus,(Macgowania,(Hudsonelpidia,(Suevoleviathan,(Temnodontosaurus,((Leptonectes,(Excalibosaurus,Eurhinosaurus)),(Stenopterygius,(Ichthyosaurus,(Brachypterygius,Aegirosaurus,Maiaspondylus,(Ophthalmosaurus,(Caypullisaurus,Platypterygius)))))))))))))))))))));