Hydrachnidia Krantz, 1978 - water mites
Count: [g] 56f;487g [20 Oct 2023]
   Superfamily Arrenuroidea Thor, 1900
  Count: [g] 19f;83g [20 Oct 2023]
     Family Mideopsidae Koenike, 1910
    Count: [g] 16g [20 Oct 2023]
       Subfamily Gretacarinae Viets, 1978 [monotypic]
      Count: [g] 1g [20 Oct 2023]
         Genus Gretacarus Viets, 1978
        Count: -