FIGURE 12 in Phylogeny of iguanodontian dinosaurs and the evolution of quadrupedality

FIGURE 12. Sternals of A, Tenontosaurus (YPM 5456); B, the Kirkwood taxon (AM 6067); C, Macrogryphosaurus (MUCPv 321); D, Hypselospinus (NHMUK R1885). A and B are right sternals in ventrolateral view, C and D are coosified left and right sternals, C in caudodorsal view and D in cranioventral view, including the midline intersternal ossification. Abbreviations: cl, caudolateral process; cm, caudomedial process; iso, intersternal ossification. Scale bar equals 10 cm in A, C, and D, and 1 cm in B.