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. 2015 Apr 7;3:e857. doi: 10.7717/peerj.857

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© 2015 Tschopp 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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Anterior caudal vertebrae of Apatosaurus ajax YPM 1860 (A) and Diplodocus sp. DMNS 462 (B) in ventral view. Note the ventral keel (A; C296-1), the ventral foramen (B; C305-1) within the ventral longitudinal hollow (B; C330-1), and the anteroposteriorly expanded distal end of the transverse process (A; C316-1). Abb.: ns, neural spine. Scaled to same centrum length.