New records of water mites from Southeast Asia (Acari: Hydrachnidia) with the description of two new genera and 12 new species

Twenty-one species of water mites (Acari, Hydrachnidia) were collected in 2015 during a hydrobiological survey conducted by Burkhard Scharf in Vietnam, Laos and Cambodia. Twelve taxa new to science are described, representing the families Torrenticolidae (Torrenticola laosensis n. sp.), Limnesiidae (Limnesia scharfi n. sp.), Hygrobatidae (Vietnobates oryzae n. gen., n. sp.), Pionidae (Schwoerbelia pioniformis n. gen., n. sp., Forelia gereckei n. sp.), Aturidae (Hexaxonopsis laosensis n. sp., H. cambodiensis n. sp., H. angkoriensis n. sp., Javalbia vietnamica n. sp., Sinaxonopsis laosensis n. sp.), Athienemanniidae (Africasia purpurea n. sp.) and Arrenuridae (Arrenurus contortus n. sp.).