Comparison of the LH PV18 fish centrum (D) to an ellimmichthyiform centrum (A–C) (Horseshoeichthyes) from the Dinosaur Park Formation (Campanian) of Alberta.

<p>The notochordal foramen (NF) in the LH PV18 fish centrum (<b>D</b>) is so small that it cannot be seen from the angle of the photograph. The exact number and positions of mid-dorsal fossae (MDF) and laterodorsal fossae (LDF) are variable within the same taxon <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021376#pone.0021376-Brinkman1" target="_blank">[23]</a>. Photos (<b>A–C</b>) have been rotated to align with the general orientation of the obliquely figured LH PV18 fish centrum. Picture (<b>A</b>) was also flipped horizontally to simulate the right lateral view. Additional abbreviations: NA: neural arch articular pit. (<b>A–C</b>) adapted from Newbrey et al. (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021376#pone.0021376-Newbrey1" target="_blank">[22]</a>, Figure 9h). (<b>D</b>) adapted from Sereno et al. (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0021376#pone.0021376-Sereno1" target="_blank">[14]</a>, Figure S8B).</p