The first record of the water mite Arrenurus berolinensis from The Netherlands, with the first description of the female (Acari: Hydrachnidia)

The very rare water mite Arrenurus berolinenis is reported for the first time for theNetherlands. The species was found in a peat pit in the province of Overijssel in 2006. Previous records originate from Berlin (1896) and Eastern Prussia (1907), nowadays the Russian enclave Kaliningrad. In addition, the first description of the female is provided, which had not been reported before