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Figure 1. (1) Location map of the Iharkút vertebrate locality (Upper Cretaceous [Santonian] Csehbánya Formation, Bakony Mts, western Hungary). (2) Schematic section of the open-pit Iharkút (after Ősi and Mindszenty, 2009). The black arrow indicates the position of the bone-yielding beds that, among other fossils, provided the fragmentary skull referred to Hungarosaurus sp. (in this work) and the associated Hungarosaurus skeletons. (3) The Iharkút locality from a bird's eye view. Asterisk marks the site where the fragmentary skull was found.

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Figure 2. Fragmentary skull (PAL 2013.23.1) and its CT scan visualisation referred to Hungarosaurus sp. from the Upper Cretaceous (Santonian) Csehbánya Formation, Iharkút, western Hungary. (1–2) right lateral; (3–4) left lateral; (5–6) ventral view. Scale bar is 2 cm. For abbreviations see text.

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Figure 3. Fragmentary skull (PAL 2013.23.1) and its CT scan visualisation referred to Hungarosaurus sp. from the Upper Cretaceous (Santonian) Csehbánya Formation, Iharkút, western Hungary. (1–2) anterior; (3–4) posterior; (5–6) dorsal view. Scale bar is 2 cm. For abbreviations see text.

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Figure 4. CT slices through the fragmentary skull (PAL 2013.23.1) referred to Hungarosaurus sp. from the Upper Cretaceous (Santonian) Csehbánya Formation, Iharkút, western Hungary. (1–2) axial slice through the basisphenoid; (3–4) parasagittal slice through the openings of the posterior cranial nerves.

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Figure 5. Topographic drawing of a silicone rubber mould of the endocranial cavity taken from the braincase of Hungarosaurus sp. (PAL 2013.23.1). (1) dorsal; (2) right lateral; (3) ventral view. Scale bar is 2 cm. For abbreviations see text.

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Figure 6. Comparison of ankylosaur endocasts in left lateral view. (1) cf. Polacanthus sp. (inverted image; redrawn from Norman and Faiers, 1996); (2) Euoplocephalus sp. (redrawn from Coombs, 1978a); (3) Struthiosaurus transylvanicus (redrawn from Pereda Suberbiola and Galton, 1994); (4) Struthiosaurus austriacus (redrawn from Pereda Suberbiola and Galton, 1994); (5) Hungarosaurus sp. (reversed image); (6) Panoplosaurus mirus (modified from Witmer and Ridgely, 2008). Note the hypertrophied cerebellum in Struthiosaurus transylvanicus and Hungarosaurus sp. Scale bars are 2 cm. For abbreviations see text.

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