(Utatsusaurus,(Chaohusaurus,((Mixosaurus_cornalianus,((Cymbospondylus_petrinus,Cymbospondylus_buchseri,Cymbospondylus_nichollsi),(Basanosaurus,(Shastasaurus,(Shonisaurus,Metashastasaurus))))),(Toretocnemus,(Californosaurus,(Suevoleviathan,(Ichthyosaurus,Stenopterygius)))))));