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The taxonomy of the South African proterosuchids (Reptilia, Archosauromorpha)
- J. Welman
- 15 June 1998
The diagnosis for the species includes features such as: the dentigerous borders of the premaxilla and maxilla form an angle of about 120 degrees; the palatal teeth are arranged in a specific pattern; the laterosphenoid is not reduced in its anterior development; and the epipterygoid is axe-shaped and has an anteroventral medial process.
Vertebrate Burrow Complexes from the Early Triassic Cynognathus Zone (Driekoppen Formation, Beaufort Group) of the Karoo Basin, South Africa
Abstract A scratch-marked burrow complex with multiple branching tunnels and terminal chambers was excavated from the Lower Triassic Driekoppen Formation, northeastern Free State, South Africa. The…
A new trirachodontid cynodont from the lower levels of the Burgersdorp Formation (Lower Triassic) of the Beaufort Group, South Africa and the cladistic relationships of Gondwanan gomphodonts
A new trirachodontid cynodont is described from the base of the Burgersdorp Formation (Subzone A fauna of the Cynognathus Assemblage Zone), of the South African Karoo Basin and is characterized by circular to ovoid in outline upper postcanines and the absence of a maxillary platform lateral to the postcanine series.
The laterosphenoid bone of early archosauriforms
The laterosphenoid is an ossification of the pila antotica neurocranial cartilage in the anterior sidewall of the braincase of crocodylians and birds that appears to have been induced by shifting jaw muscle origins from the skull roof to the anterolateral wall of the headcase.
A SECOND SPECIMEN OF LEMUROSAURUS PRICEI (THERAPSIDA: BURNETIAMORPHA)
A cladistic analysis of 10 therapsids, two outgroups, and 38 characters indicates that Lemurosaurus is the sister taxon to a clade including Bullacephalus, Proburnetia, and Burnetia and that it is most parsimonious to infer that burnetiamorphs originated in southern Africa.
A second varanopseid skull from the Upper Permian of South Africa: implications for Late Permian ‘pelycosaur’ evolution
Late Permian terrestrial faunas of South Africa and Russia are dominated taxonomically and ecologically by therapsid synapsids. On the basis of a single specimen from the Upper Permian of South…
The most basal anomodont therapsid and the primacy of Gondwana in the evolution of the anomodonts
- S. Modesto, B. Rubidge, J. Welman
- Environmental Science, BiologyProceedings of the Royal Society of London…
- 22 February 1999
The basal position of Anomocephalus, together with its South African occurrence, strongly supports the postulate that a Gondwanan distribution was ancestral for anomodonts.
Statistical analysis of skulls of Triassic proterosuchids (Reptilia, Archosauromorpha) from South Africa
The results show that all the specimens can be fitted into a growth series, supporting a hypothesis expressed by Cruickshank (1972) that the South African proterosuchids did not display a strong degree of sexual dimorphism.
Confirmation of the occurrence of Cynognathus Zone (Kannemeyeria-Diademodon Assemblage-zone) deposits (uppermost Beaufort Group) in the northeastern Orange Free State, South Africa
The uppermost sedimentary rocks of the Tarkastad Subgroup in the northeastern Orange Free State have been interpreted as a northern facies of the Burgersdorp Formation. Previous authors have not…
A new find of Trematosuchus (Amphibia, Temnospondyli) from the Cynognathus Zone of South Africa
The presence of T. sobeyi in the lowermost strata of the Cynognathus Zone in South Africa, in association with some other forms related to the Upper Olenekian (Middle Buntsandstein) tetrapod assemblage of Europe, indicates that these strata belong to the Scythian in contrast to the higher strata which are Anisian.