Hydrachnidia Krantz, 1978 - water mites Superfamily Arrenuroidea Thor, 1900 Family Arrenuridae Thor, 1900 Genus Thoracophoracarus Viets, 1914 1 Subgenus Thoracophoracarus (Thoracophoracarus) Viets, 1914 2 Subgenus Thoracophoracarus (Thoracophorurus) Viets, 1942