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. 2014 Jun 5;9(6):e98821. doi: 10.1371/journal.pone.0098821

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© 2014 Xing et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Bactrosaurus johnsoni (AMNH 6553). (B) Levnesovia transoxiana (CCMGE 579/12457). (C) Gilmoreosaurus mongoliensis (AMNH FARB 30653, reversed). (D) Amurosaurus riabinini (AEHM 1/12). (E) Edmontosaurus regalis (CMN 2289). (F) Brachylophosaurus canadensis (MOR 1071-8-15-98-573). Positions of maxillary foramina are indicated by arrows.