Acknowledgements
We would like to thank the staff of the Royal Central African Museum, Tervuren, Belgium; The Natural History Museum, London, United Kingdom; The American Musuem of Natural History, New York, USA; The Natural History Museum in Vienna, Austria. Specifically, we thank Didier van der Spiegel, Christoph Allard, Rudy Jocque, Jan Beccaloni, Pio Colmenares, Lorenzo Prendini, Christoph Horweg and Michael Seiter.