Lateral view of maxillary bones showing differences in tooth row morphology of macrostomatan snakes.

<p>(A) the boid <i>Eunectes notaeus</i>, (<b>b</b>) the bolyeriid <i>Casarea dussumieri</i> <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0057583#pone.0057583-Maisano2" target="_blank">[44]</a>, (C) <i>Kataria anisodonta</i> and (D) the opistoglyphous colubroid <i>Philodryas trilineatus</i>. Not to scale. amx, anterior maxilla; ecp, ectopterygoid process; plp, palatine process; pmx, posterior maxilla; soo, suborbital ossification.