Hydrachnidia Krantz, 1978 - water mites Superfamily Lebertioidea Thor, 1900 Family Limnesiidae Thor, 1900 Subfamily Rheolimnesiinae Goldschmidt, 2004 1 Genus Guanacastacarus Goldschmidt, 2004 2 Genus Rheolimnesia Lundblad, 1954 3 Genus Siboneyacarus Orghidan, Gruia, Georgesco & Viña Bayés, 1977