Auriculella auricula

The length of the shell attains 8 mm, its diameter 4 mm. (Original description in Latin) The shell is ovate-acute in shape, imperforate, and relatively thick. It is finely striated and displays a yellowish coloration. The spire is conical and terminates in an obtuse apex. There are five contiguous whorls, the last of which is ventricose (inflated) and exhibits a slightly carinate (keeled) form. The aperture is subquadrangular in shape. The peristome is acute and thickened internally, with the outer side appearing flexed or bent. The columella is unidentate, featuring a single tooth. At the base of the aperture, the shell is further fortified by a highly prominent, elevated lamella. (Newer description in 2020) The shell can be either dextral or sinistral in its coiling and is characterized by flat-sided whorls and an obtuse apex. On average, the shell reaches a height of 8.0 p.m. 0.4 mm and a width of 4.3 p.m. 0.2 mm. It typically consists of approximately six whorls (6.0 p.m. 0.2), with the aperture measuring 4.1 p.m. 0.2 mm in height and 3.1 p.m. 0.2 mm in width. The internal anatomy features a columella equipped with a single strong lamella, notably lacking an axial ridge. …