Permo-Triassic "lizards" from the Karroo

Show simple item record Carroll, Robert L 2015-01-09T06:49:19Z 2015-01-09T06:49:19Z 1975
dc.identifier.issn 0078-8554
dc.description.abstract Three genera of sauropsid reptiles from the Permo-Triassic beds of South Africa - Saurosternon Huxley, Paliguana Broom and Palaegama Broom - were originally described as lizards, or the immediate ancestors of that group. Restudy of these forms confirms that they are close to the ancestry of later Mesozoic and Cenozoic squamates. The skull is somewhat primitive, but in size, proportions and function extremely similar to that of Kuehneosaurus. The pectoral girdle is lacertoid in the proportions and orientation of the clavicles and interclavicle; the anterior margin of the scapulocoracoid is fenestrate, and the articulating surface of the glenoid is very short. A sternum is present and one specimen shows ventral connections between the ribs and the sternum. In Saurosternon, the forelimb can be seen as very similar to that of living lizards, with special epiphyseal articulating surfaces on the proximal end of the humerus and distal end of the ulna. The pelvic girdle remains primitive, but the rear limb is close to the pattern in lizards. The fifth metatarsal is not obviously hooked, and all five distal tarsals are retained, but the proportions and functions of the ankle presage the condition in living lizards. Epidermal scales are present. Following Romer, these forms are all included in the Family Paliguanidae. They are placed in the Suborder Lacertilia, provisionally in the Infraorder Eolacertilia. en_ZA
dc.description.sponsorship Merrill Foundation; National Research Council of Canada; Faculty of Graduate Studies and Research, McGill University en_ZA
dc.language.iso en en_ZA
dc.publisher Bernard Price Institute for Palaeontological Research en_ZA
dc.subject Diapsid en_ZA
dc.subject Beaufort Group en_ZA
dc.title Permo-Triassic "lizards" from the Karroo en_ZA
dc.type Article en_ZA

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