(Ancestor,((Claudiosaurus,Youngina),(Pachypleurosaur,(Eusauropterygia,((Paraplacodus,Placodus),(Henodus,(Cyamodus,(Psephoderma,Placochelys)))))))); (Ancestor,((Claudiosaurus,Youngina),(Pachypleurosaur,(Eusauropterygia,((Paraplacodus,Placodus),(Cyamodus,(Psephoderma,(Placochelys,Henodus))))))));