Did gorgonopsians survive the end-Permian "Great Dying"? : A re-appraisal of three gorgonopsian specimens (Therapsida, Theriodontia) reported from the Triassic Lystrosaurus declivis Assemblage Zone, Karoo Basin, South Africa - Benoit, Julien (University of the Witwatersrand. Evolutionary Studies Institute and School of Geosciences) ; Kammerer, Christian F. (North Carolina Museum of Natural Sciences) ; Dollman, Kathleen (European Synchrotron Radiation Facility) ; Groenewald, David (Institut Català de Paleontologia Miquel Crusafont) ; Smith, Roger M. H. (University of the Witwatersrand. Evolutionary Studies Institute and School of Geosciences)