Amphidromus atricallosus atricallosus Gould, 1843

From Ranong Province, western Thailand

    Occurs from Myanmar, northern, western and southern Thailand, and Malaya. It is distinguishable by the black or dark brown parietal callus. All of the other subspecies have a white callus. Color patterns range from pure white to pure yellow with most specimens being yellow with a wide white subsutural band. Occurs as both dextral and sinistral specimens.