English: Original description: Skull of Heterodontosaurus tucki from the Lower Jurassic Upper Elliot and Clarens formations of South Africa. New skull reconstruction in lateral view showing the dentition with intermediate wear (scleral ring not shown). Pink tone indicates wear facets. Abbreviations: a angular aantfe accessory antorbital fenestra adf anterior dentary foramen adi arched diastema antfo antorbital fossa apd articular surface for the predentary apmf anterior premaxillary foramen asaf anterior surangular foramen be buccal emargination bo basioccipital bt basal tubera c coronoid d dentary d2, d11 dentary tooth 2, 11 dbo dentary boss eantfe external antorbital fenestra emf external mandibular fenestra emfo external mandibular fossa en external naris f frontal iantfe internal antorbital fenestra j jugal jfl jugal flange jh jugal horn l lacrimal lrfo lateral retroarticular fossa m maxilla m1, 11 maxillary tooth 1, 11 n nasal nf narial fossa p parietal pap palpebral pd predentary pm premaxilla pm1, 3 premaxillary tooth 1, 3 pmfo promaxillary fossa po postorbital pof postorbital fossa popr paroccipital process prf prefrontal psaf posterior surangular foramen q quadrate qf quadrate foramen qj quadratojugal sa surangular sar surangular ridge sq squamosal.