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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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Left portion of the basicranium of the extant grey whale Eschrichtius robustus (USNM 364973) in ventrolateral view, highlighting the position of the paroccipital concavity.