1. Geron J. Bloem, HAS University of Applied Sciences, Onderwijsboulevard 221, 5223 DE's-Hertogenbosch, The Netherlands; E-mail: g.bloem@live.nl
2. Jinze Noordijk, European Invertebrate Survey – the Netherlands / Naturalis Biodiversity Center, Darwinweg 2, 2300 RA Leiden, The Netherlands; E-mail: jinze.noordijk@naturalis.nl