Aquatic-arachnid
Guides
Hydrachna
Hydrachna is a genus of water mites comprising over 80 described species and representing the sole genus in the family Hydrachnidae. These mites are obligate aquatic arachnids found in freshwater habitats. The larvae are ectoparasites of aquatic insects, particularly water beetles and water boatmen, attaching to the thorax and abdomen of hosts. Some host species have developed apparent immunity to parasitism after prolonged exposure.