1. Institute of Earth Sciences, Faculty of Natural Sciences University of Silesia in Katowice Sosnowiec Poland
2. Institute of Paleobiology, Polish Academy of Sciences Warsaw Poland
3. Section Paleontology, Institute of Geosciences University of Bonn Bonn Germany
4. Carnegie Museum of Natural History Pittsburgh Pennsylvania USA
5. Faculty of Faculty of Exact and Technical Sciences University of Silesia in Katowice Sosnowiec Poland