. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 162 ANNALS OF THE SOUTH AFRICAN MUSEUM name Heterodontosaurus was but a junior synonym of Lycorhinus and therefore not valid. In answer to this, Charig & Crompton (1974) and Hopson (1975) adequately demonstrated that generic distinctions in the dentition did exist between Heterodontosaurus and Lycorhinus. Furthermore, Galton (1972), Charig & Crompton (1974), and Hopson (1975) have all shown that Heterodontosaurus is sufficiently distinct from the Hypsilophodontidae to warrant separate familia
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 162 ANNALS OF THE SOUTH AFRICAN MUSEUM name Heterodontosaurus was but a junior synonym of Lycorhinus and therefore not valid. In answer to this, Charig & Crompton (1974) and Hopson (1975) adequately demonstrated that generic distinctions in the dentition did exist between Heterodontosaurus and Lycorhinus. Furthermore, Galton (1972), Charig & Crompton (1974), and Hopson (1975) have all shown that Heterodontosaurus is sufficiently distinct from the Hypsilophodontidae to warrant separate familial status. Thulborn (1974) later accepted a familial distinction, but continues to refer to this genus as ^Lycorhinus' (Thulborn 1978). Because of its dentition and some of its cranial characters, Heterodonto- saurus has always been considered a rather specialized ornithischian. From this Thulborn (1970<7, 197la, 1972, 1974) has inferred that heterodontosaurids were a short-lived evolutionary divergence from the basal ornithischian stock. In a previous publication Santa Luca et al. (1976), only assumed that H. tucki itself could not be ancestral to later ornithischians. This hypothesis will be thoroughly examined at the end of this study since some important similarities in the post- cranial skeleton of H. tucki and later ornithischians do exist. The result of previous work has been to clarify the familial and generic status of Heterodontosaurus. However, the question of the subordinal status of Heterodontosaurus has never been examined. It has simply been standard practice to classify all bipedal ornithischians as Ornithopoda. This is unsatis- factory for some bipedal ornithischians ( pachycephalosaurs) and so the question of subordinal status will be taken up in the Fig. 2. H. tucki. SAM-K1332. Skull, right lateral view, x Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
