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Piersigia koenikei new for the Dutch fauna and new Dutch records of Piersigia intermedia and Vietsia scutata (Acari: Hydrachnellae).
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Distribution and habitats of Berosus in The Netherlands (Coleoptera: Hydrophilidae).
Holocene evolution of tidal systems in The Netherlands: Effects of rivers, coastal boundary conditions, eco-engineering species, inherited relief and human interference