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FAUNAL AGGREGATION IN THE EARLY TRIASSIC KAROO BASIN: EARLIEST EVIDENCE OF SHELTER-SHARING BEHAVIOR AMONG TETRAPODS?

¹ Bernard Price Institute for Palaeontological Research, University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa;
² Dept. Karoo Palaeontology, Iziko South African Museum, P.O. Box 61, Cape Town 8000, South Africa abdalaf{at}geosciences.wits.ac.za

The first report of a multitaxon aggregation from the Early Triassic Lystrosaurus Assemblage Zone is presented here. The aggregation includes two vertebrates—the suricate-sized cynodont Galesaurus planiceps and a gecko-like procolophonoid Owenetta kitchingorum—and a diplopod millipede. The high degree of articulation of the skeletal remains and the preservation of delicate bones in situ suggest that the animals were either rapidly buried or died in a place protected from weathering and agents of dispersal. Two hypotheses are possible to explain this multitaxon aggregation: trapping in a floodplain gully followed by immediate burial or shelter-sharing. The latter hypothesis is favored after the analysis of the fossil evidence recorded in the South African Karoo Basin.

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