Auriculastra subula is a species of air-breathing land snail, a terrestrial gastropod mollusc in the family Ellobiidae, the salt marsh snails.
The length of the shell attains 20 mm, its diameter 7.5 mm.
(Described in Latin as Auricula dunkeri) The shell is imperforate and fusiform-oblong, possessing a solid structure that is smooth to the touch and marked only by very light longitudinal striations. It is covered in a tawny, horn-colored epidermis. The spire is convex-conic with a sharp apex, and the suture is linear and slightly jagged.
There are approximately eight whorls that are relatively flat; however, the upper whorls are irregularly eroded. The body whorl is quite large, equaling nearly two-thirds of the total shell length, and it tapers slightly at the base. The aperture is positioned nearly vertically and is narrowly semi-oval in shape.
The columella is slightly twisted and folded. The apertural wall is armed with two features: a moderate, oblique fold situated below the middle, and a second, nearly obsolete fold located near the columella. The peristome is sharp but slightly thickened on the inside; its columellar margin is scarcely dilated, reflected, and fused to the body of the shell.
This species was originally found in New Ireland Province, Papua New Guinea; its occurs widely in Southeast Asia, the Philippines, Indonesia, Australia and Japan.