Holotype: length 8.8 mm, width 3.7 mm; Largest paratype: length 8.3 mm, width 3.6 mm; Smallest paratype (juvcnile): length 3.9 mm. width 2.9 mm.

Limited to Mauritius.

The shell is moderately small for the genus (maximum length 9 mm) and lanceolate. The spire is high, consisting of one and one-half tilted nuclear whorls and five moderately narrow, flattened postnuclear whorls. The suture is impressed but is largely obscured by varical buttresses. The body whorl is of moderate size, slender, and flattened. The aperture is moderately small and ovate, with no perceptible anal sulcus. The outer apertural lip is moderately thickened, barely erect, and bears six or seven barely- perceptible denticles on its inner surface. The columellar lip is entirely adherent. The siphonal canal is moderately short, narrowly open, bent to the left, and dorsally recurved. The body whorl bears two major lateral varices. The first postnuclear whorl bears six varices. The first two or three postnuclear whorls mark the disappearance of the dorsal and the ventral varices. The two minor lateral varices are reduced to axial costae, except at their anterior ends, where they are moderately prominent. Spiral sculpture in the form of seven broad, weak cords is apparent only on the leading edges of the varices.
The shell is waxy translucent white, covered bv a flat-white intritacalx. The moderately strong axial striae of the intritacalx are interrupted by regularly incised pits that are deeper opposite the direction of growth. These pits or furrows are transversely aligned but are not continuous.
Radwin & D'Attilio, 1976. Original Description.

This species most resembles A. ponderi, but differs in its peculiarly tilted protoconch, its coarser, axially striate intritacalx, and the presence in the intritacalx of open or partly closed transverse tubes. The shell of A. mauritiana is also more compressed and lacks the pale periostracum of A. ponderi.
Radwin & D'Attilio, 1976.