A partial skull of ankylosaur from the Upper Cretaceous (Santonian) Csehbanya Formation
in Iharkut and the endocranial cast taken from it are described. The morphology of
the exoccipital, the elongated 'neck' region of the basioccipital, the shape of the
occipital condyle, and the different flexure of the medulla relative to the forebrain
unambiguously differentiate this specimen from the basicranium of Struthiosaurus,
so it is assigned to Hungarosaurus sp. Whereas the endocranial cast reflects a brain
generally similar to those of other ankylosaurs, the dorsally hypertrophied cerebellum
(also present is Struthiosaurus transylvanicus) is quite unusual within the group
suggesting a more sophisticated cerebral coordination of posture and movement, and
perhaps a more cursorial locomotary habit than predicted for other ankylosaurs.
