1. Natuurhistorisch Museum Maastricht, De Bosquetplein 6-7, 6211 KJ Maastricht, the Netherlands
2. Maastricht Science Programme, Faculty of Science and Engineering, Maastricht University, PO Box 616, 6200 MD Maastricht, the Netherlands
3. Oertijdmuseum, Bosscheweg 80, 5283 WB Boxtel, the Netherlands
4. Uniwersytet Opolski, Katedra Biosystematyki, ul. Oleska 22, 45-052 Opole, Poland
5. Museum Natura Docet, Oldenzaalsestraat 39, 7591 GL Denekamp, the Netherlands
6. Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, the Netherlands
7. Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, the Netherlands