New insights into the phylogeny and skull evolution of stegosaurian dinosaurs: An extraordinary cranium from the European Late Jurassic (Dinosauria: Stegosauria)

Skulls of ornithischian dinosaurs (A–E) and interpretative drawings in dorsal view (F–H). A, Lesothosaurus diagnosticus Galton, 1978 (NHMUK PV RU B23). B Scelidosaurus harrisonii Owen, 1861 (NHMUK PV R1111). C, F Dacentrurus armatus Owen, 1875 (MAP-9029). D Stegosaurus stenops Marsh, 1887 (NHMUK PV R36730). E Europelta carbonensis Kirkland et al., 2013 (AR-1-544/10). G Huayangosaurus taibaii Dong, Tang & Zhou, 1982 (modified from Sereno and Dong 1992). H S. stenops (modified from Galton and Upchurch 2004). Abbreviations: aso, anterior supraorbital; f, frontal; l, lacrimal; mso, medial supraorbital; n, nasal; o, orbit; p, parietal; pf, prefrontal; pm, premaxilla; po, postorbital; pso, posterior supraorbital; sq, squamosal; stfe, supratemporal fenestra. Numbers indicate the morphological character and its scoring.