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. 2016 Jan 28;4:e1572. doi: 10.7717/peerj.1572

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©2016 Marx et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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Vertex of the cetotheriids Piscobalaena nana (MNHN SAS1616), Herpetocetus morrowi (UCMP 124950) and “Metopocetus” vandelli (MUHNAC A1) in dorsal view, showing the size and location of the primary dorsal infraorbital foramen.