Nasofrontal articulation of selected hadrosaurids in phylogenetic context.

<p>For each terminal taxon, the lower figure is a reconstruction of the skull roof in dorsal view and the upper figure is a schematic cross-section along the line of section (LOS) indicated. The frontal has been highlighted in dark blue for clarity, the nasal is orange in cross-sections (and omitted from dorsal view for clarity), and the nasofrontal/nasoprefrontal articulation surface is in light blue. Cut bone is red and missing bone is cross-hatched. <i>Gryposaurus notabilis</i>, AMNH 5350; <i>Tsintaosaurus spinorhinus</i>, combination of IVPP 725 and 818; <i>Jaxartosaurus aralensis</i>, PIN (Paleontological Institute, Moscow, Russia) 1/5009; <i>Amurosaurus riabinini</i>, AENM (Amur Natural History Museum, Blagoveschensk, Russia) 1/232; and <i>Parasaurolophus tubicen</i>, PMU (Paleontological Museum, Uppsala, Sweden) R222.