(Paleothyris,(Araeoscelis,(Petrolacosaurus,(Coelurosauravus,(Claudiosaurus,((Youngina,Gephyrosaurus),(Pachypleurosauridae,non_pachypleurosaur_Sauropterygia))))))); (Paleothyris,(Petrolacosaurus,(Araeoscelis,(Coelurosauravus,(Claudiosaurus,((Youngina,Gephyrosaurus),(Pachypleurosauridae,non_pachypleurosaur_Sauropterygia)))))));