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Skulls of Mamenchisaurus youngi (A; modified from Ouyang & Ye, 2002), Camarasaurus sp. USNM 13786 (B) Giraffatitan brancai (C; modified from Janensch, 1935), Diplodocus sp. CM 11161 (D) and Galeamopus sp. SMA 0011 (E) in lateral view, illustrating the states of the characters 1, 5, 13, 14, 15, 19, 20, 21, 37, 38, 39, 45, 46, 47, 55, 113. Not to scale.
