Hydrachnidia Krantz, 1978 - water mites Superfamily Arrenuroidea Thor, 1900 Family Chappuisididae Motaş & Tanasachi, 1946 Subfamily Morimotacarinae Imamura, 1962 1 Genus Morimotacarus Imamura, 1962 2 Genus Yachatsia Cook, 1963