1. Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, Johannesburg, South Africa e-mail: julieta@uj.ac.za
2. Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, Johannesburg, South Africa e-mail: marlinae@uj.ac.za
3. Department of Geology, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, Johannesburg, South Africa
4. Natural History Museum, University of Oslo, P.O. Box 1172 Blindern, N-0318 Oslo, Norway e-mail: tom.andersen@nhm.uio.no