Left premaxilla and maxilla (PMU 24705/1a [formerly PMU R 233 a]) of <i>Euhelopus zdanskyi</i> in rostral (A), dorsal (B), left lateral (C), ventral (D), caudal (E), and medial (F) views.

<p>Note the distinctive buttresses on the lingual side of the teeth, located near the base of the crown.</p

Reconstructed left pterygoid (PMU 24705/1l [formerly PMU R 233 ä] and PMU 24705/1w [formerly PMU R 233 ö]) of <i>Euhelopus zdanskyi</i> in rostral (A), dorsal (B), left lateral (C), ventral, (D), caudal (E), and medial (F) views.

<p>Note that the point of contact between the two portions is offset – the two elements no longer attach perfectly due to post mortem deformation of the element.</p

Right quadratojugal (PMU 24705/1j [formerly PMU R 233 å]) of <i>Euhelopus zdanskyi</i> in rostral (A), dorsal (B), left lateral (C), ventral (D), caudal (E), and medial (F) views; and the dorsal process of the right quadratojugal (PMU 24705/1j [formerly PMU R 233 å]) in lateral (G) and medial (H) views; in lateral view, the dorsal end is to the left, while in medial view the dorsal end is to the right.

<p>Right quadratojugal (PMU 24705/1j [formerly PMU R 233 å]) of <i>Euhelopus zdanskyi</i> in rostral (A), dorsal (B), left lateral (C), ventral (D), caudal (E), and medial (F) views; and the dorsal process of the right quadratojugal (PMU 24705/1j [formerly PMU R 233 å]) in lateral (G) and medial (H) views; in lateral view, the dorsal end is to the left, while in medial view the dorsal end is to the right.</p

PMU 24705/1t (formerly PMU R 233 p), a probable splenial.

<p>PMU 24705/1t (formerly PMU R 233 p), a probable splenial.</p

Right postorbital (PMU 24705/1 g [formerly PMU R 233 a]) of <i>Euhelopus zdanskyi</i> in rostral (A), dorsal (B), right lateral (C), ventral (D), caudal (E), and medial (F) views; and PMU 24705/1v (formerly PMU R 233 y), a portion of bone still partially embedded in matrix which may be the tapered end of the jugal process of the postorbital (G).

<p>Right postorbital (PMU 24705/1 g [formerly PMU R 233 a]) of <i>Euhelopus zdanskyi</i> in rostral (A), dorsal (B), right lateral (C), ventral (D), caudal (E), and medial (F) views; and PMU 24705/1v (formerly PMU R 233 y), a portion of bone still partially embedded in matrix which may be the tapered end of the jugal process of the postorbital (G).</p

Reconstruction of the skull of <i>Euhelopus zdanskyi</i> based on the holotype elements (PMU 24705/1 [formerly PMU R 233]) from “exemplar a” in rostral (A), dorsal (B), left lateral (C), ventral (D), caudal (E), and medial (F) views; the right side of the skull has been removed in medial view to show the organisation of the palatal and mandibular elements.

<p>More complete and/or better preserved elements were used in this reconstruction when both left and right elements were preserved. The reconstructions of the skull provided by Wiman <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0079932#pone.0079932-Wiman1" target="_blank">[43]</a> (G) and Mateer and McIntosh <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0079932#pone.0079932-Mateer1" target="_blank">[44]</a> (H) are presented, as is a line drawing of the skull as reconstructed in this work (I).</p