ON CYRBASIODON BOYCEI, BROOM 1931, (CYNODONTIA PROCYNOSUCHIDAE), FROM SOUTH AFRICA
Mendrez, Christiane Helene
BERNARD PRICE INSTITUTE FOR PALAEONTOLOGICAL RESEARCH
The revision of the type of Cyrbasiodon boycei has led the author to conclude that the maxilla, which constitutes this type, bears fourteen teeth corresponding to a complete maxillary series: 3 precanines, 1 canine and 10 postcanines. The general pattern of the teeth and the aspect of a remnant of secondary palate agree with those of the Cynodontia Procynosuchidae. Within this family, Cyrbasiodon can be favourably compared with the genera Leavachia and Parathrinaxodon. However, because of the anterior breadth of the palatal process of the maxilla, the different number of precanines, and of a slight difference in the canine's ornamentation, it seems preferable to maintain Cyrbasiodon as a separate genus, until the variations of the other Procynosuchidae are better known. The comparison of the tooth pattern of the Procynosuchidae with that of Diarthrognathus has shown strong similarities leading to the conclusion that the tooth pattern of the former foreshadows that of the latter.