Hydrachnidia Krantz, 1978 - water mites
   Superfamily Arrenuroidea Thor, 1900
     Family Arrenuridae Thor, 1900
       1 Genus Allarrenurus Viets, 1961
       2 Genus Arrenurus Dugès, 1834
       3 Genus Hamappendix Walter & Bader, 1952
       4 Genus Micruracaropsis Viets, 1939
       5 Genus Srilankurus Pešic, Zawal, Smit & Bankowska, 2018
       6 Genus Thoracophoracarus Viets, 1914
       7 Genus Xenthoracaphorus Cook, 1988
       8 Genus Wuria Viets, 1916