Figure 1.

Umoonasaurus demoscyllus (AM F99374) skull in (a) dorsal, (b) anterolateral snout region showing crests, (c) lateral, (d) posterior and (e) palatal views (palate image is from a cast, original specimen is fixed to a display base and thus inaccessible). Abbreviations: aipv, anterior interpterygoid vacuity; bo, basioccipital; bt, basioccipital tuber; ec, ectopterygoid; en, external naris; ep, epipterygoid; ex–op, exoccipital–opisthotic; fmg, foramen magnum; fr-cr, fontal crest; in, internal naris; max, maxilla; mcr, midline crest (premaxilla); or, orbit; pa, parietal; pal, palatine; par, parasphenoid; pb, postorbital bar base; pif, pineal foramen; pifc, pineal foramen crest; pmx, premaxilla; ppr, paroccipital process; pt, pterygoid; pt–ec, pterygoid–ectopterygoid complex; pt-lap, pterygoid lappet; qr-pt, quadrate ramus of pterygoid; qu, quadrate; sq, squamosal; vo, vomer.