Auriculastra duplicata is a species of air-breathing land snail, a terrestrial gastropod mollusc in the family Ellobiidae, the salt marsh snails.
(Original description in Latin) The shell is imperforate, oblong, and solid, and is arcuately striated; beneath the deciduous epidermis it is greenish-tawny to white. The spire is short, conical, and somewhat blunt; the suture is obsolete (indistinct). The 5 - 6 whorls are contiguous; the body whorl forms the greater part of the length, is inflated above the middle, and is slightly attenuated at the base. The aperture is vertical and semi-elliptical, and is canaliculated at the base. The apertural wall is furnished with a nodiform callus and, below it, with a transverse, lamella-like fold. The columella shows two oblique, parallel folds. The peristome is simple, with the right margin slightly arched and somewhat callous within.
This species occurs in the Philippines and Korea; it also occurs in Japan in Honshà «, Kyà «shà « and Shikoku. It is considered to be a vulnerable species in Japan, in Okinawa Prefecture.