<i>Fruitadens haagarorum</i>, LACM 115747 (holotype), right dentary.

<p>Dentary in lateral (A, C, E), medial (B, D, F), and dorsal (G, I, J) views, with photographs (A, B, G), external renderings from μCT data (C, D, I), and reconstructions from μCT data (E, F, J). Reconstructed and extracted dentition in medial view (H). Close-up of the reconstructed and extracted posterior replacement teeth in lateral view (K). Close-up of the external rendering showing the symphyseal region in medial view (L). Longitudinal CT slice (M) through the entire element and sagittal CT slice (N) through the anterior part of the mandible. See also <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0031556#pone.0031556.s004" target="_blank">video S2</a>. Elements in the CT reconstructions are colour-coded as follows: dentary, blue; functional teeth, yellow; replacement teeth, orange; internal canals, red. The dentary has been made transparent in order to better visualize its internal anatomy. Abbreviations: 1pc, position of the ‘pre-caniniform’ (missing in this specimen); 2can, caniniform tooth in second tooth position; adf, anterior dentary foramen; con, concavity dorsal to the symphyseal surface; for, foramina; mc, mandibular canal within the dentary; mgr, Meckelian groove; rec, replacement crown; rfor, replacement foramen; sym, symphyseal surface; syri, curved ridge marking dorsal margin of symphysis. Numbers indicate tooth positions from anterior to posterior.