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Rubidge tetrapod synchrotron scanning

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CaseHeader

Status: 

HeritageAuthority(s): 

Case Type: 

ProposalDescription: 

The specimen comprises a block of siltstone (7x6cm) containing the fossilised sacral and caudal regions as well as the hind limbs and pes of a small tetrapod. Based on the morphology of the pes, the specimen may represent a diapsid. Given its Middle Permian age, this would represent the earliest fossil of a diapsid from the Karoo Supergroup. The specimen was collected on an expedition organised by Bruce Rubidge to the Abrahamskraal Formation of the Beaufort group in the district of Beaufort West in the western Cape Province. Specimen number: BP/1/7280

Expanded_Motivation: 

For more than 2 decades Bruce Rubidge has systematically been collecting fossils from the Lower Beaufort Abrahamskraal Formation with the intention of understanding Middle Permian biodiversity in the continental realm of Gondwana. This has involved extensive fieldwork and redescription of fossil taxa (eg. Angielczyk & Rubidge 2013; Day et al. 2013; Rubidge et al 2013; Rubidge 2005a&b; Smith et al. 2012). In 2013 members of our team discovered the first fossil of what appears to be a diapsid from the Middle Permian of South Africa. This would represent the earliest known representative of Diapsida from South Africa and the southern hemisphere (Modesto & Reisz 2002; Mueller 2004; Reisz et al. 2011). As such, it is an extremely important fossil with potential to shed light on diapsid origins and early biogeography. This proposal is for scanning of the specimen to enable us to undertake a complete morphological and taxonomic description.

ApplicationDate: 

Monday, August 11, 2014 - 17:01

CaseID: 

6199

OtherReferences: 

ReferenceList: 

CitationDate Retrieved
ANGIELCZYK, K. D., & RUBIDGE, B. S. 2013. Skeletal morphology, phylogenetic relationships and stratigraphic range of Eosimops newtoni Broom, 1921, a pylaecephalid dicynodont (Therapsida, Anomodontia) from the Middle Permian of South Africa. Journal of Systematic Palaeontology, 11(2), 191-231. CISNEROS, J.C., ABDALA, F., ATAYMAN, S., RUBIDGE, B.S., ŞENGÖR, C. & SCHULTZ, C.L. 2012. A carnivorous dinocephalian from the Middle Permian of Brazil and tetrapod dispersal in Pangaea. Proceedings of the National Academy of Sciences 109 (5), 1584–1588. CISNEROS, J.C, ABDALA, N.F., RUBIDGE, B.S., DENTZIEN-DIAS, P.C. & BUENO, A. DE O. 2011. Dental occlusion in a 260-million-year-old therapsid with saber canines from the Permian of Brazil. Science 331, 1603–605. DAY, M., RUBIDGE, B.S., ALMOND, J. & JIRAH, S. 2013. Biostratigraphic correlation in the Karoo: the case of the Middle Permian parareptile Eunotosaurus. South African Journal of Science. 109(3/4), Art. #0030, 4 pages. http://dx.doi.org/10.1590/sajs.2013/20120030 EZCURRA, M.D., SCHEYER, T.M. & BUTLER, R.J. 2014. The origin and early evolution of Sauria: reassessing the Permian saurian fossil record and the timing of the crocodile-lizard divergenece. PLoS ONE 9, e89165. MODESTO, S.P. & REISZ, R.R. 2002. An enigmatic new diapsid reptile from the Upper Permian of Eastern Europe. Journal of Vertebrate Paleontology 22, 851–855. MUELLER, J. 2004. The relationships among diapsid reptiles and the influence of taxon selection. In Recent Advances in the origin and early radiation of vertebrates (eds Arratia, G., Wilson, M.V.H. & Cloutier R.), pp. 379–408. Munich, Germany: Verlag Dr. Freidrich Pfeil. REISZ, R.R., MODESTO, S.P. & SCOTT, D. 2000. Acanthotoposaurus bremneri and the origin of the Triassic archosauromorph reptile fauna of South Africa. South African Journal of Science 96, 443–445. REISZ, R.R., MODESTO, S.P. & SCOTT, D.M. 2011. A new Early Permian reptile and its significance in early diapsid evolution. Proceedings of the Royal Society B 278, 3731–3737. RUBIDGE, B.S. 2005. Re-uniting lost continents – fossil reptiles from the ancient Karoo and their wanderlust. South African Journal of Geology 108 (3), 135–172. (64 citations) RUBIDGE, B.S. 2005. Middle-Late Permian tetrapod faunas from the South African Karoo and their biogeographic significance. New Mexico Museum of Natural History and Science Bulletin 30, 292–294.
Monday, August 11, 2014
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The specimen comprises a block of siltstone (7x6cm) containing the fossilised sacral and caudal regions as well as the hind limbs and pes of a small tetrapod.
AdditionalDocuments
  1. PDF icon Detailed proposal for synchotron scanning

Public Comments

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Bruce Rubidge
6 years 2 months ago
Evolutionary Studies Institute

Specimen BP/1/7280, which had been prepared a the ESI was taken to the University of Birmingham by Prof Richard Butler in 2014, and was returned to the ESI in June 2015. We were hoping that the specimen, which is very fragmentary, may be the remains of an archosaur. After close examination by Prof Butler and his colleagues, they concluded that it was not an archosaur, but may rather be ter... more

 

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