Hydrachnidia Krantz, 1978 - water mites
   Superfamily Eylaoidea Leach, 1815
     Family Piersigiidae Oudemans, 1902
       Subfamily Piersigiinae Oudemans, 1902
         1 Genus Piersigia Protz, 1896
         2 Genus Austrapiersigia Smit, 1998