FIGURE 4 in A reappraisal of the cranial and mandibular osteology of the spinosaurid Irritator challengeri (Dinosauria: Theropoda)

FIGURE 4. Interpretative line drawings of the re-arranged and articulated skull of Irritator challengeri (SMNS 58022). A, dorsal view; B, ventral view without the lower jaw. Speculatively, grey silhouettes add unknown parts to the skull known from other spinosaurids. Abbreviations: boc, basioccipital; ep, ectopterygoid; f, frontal; j, jugal; l, lacrimal; lsp, laterosphenoid; m, maxilla; n, nasal; oto, otoccipital; par, parietal; pbsp, parabasisphenoid; pm, premaxilla; po, postorbital; pro, prootic; prf, prefrontal; pt, pterygoid; q, quadrate; qj, quadratojugal; sur, surangular; soc, supraoccipital; sq, squamosal.