Hydrachnidia Krantz, 1978 - water mites Superfamily Lebertioidea Thor, 1900 Family Limnesiidae Thor, 1900 Subfamily Neomamersinae Lundblad, 1953 1 Genus Arizonacarus Smith & Cook, 1994 2 Genus Meramecia Cook, 1963 3 Genus Neomamersa Lundblad, 1954