The new species is distinguished by its small narrow shell with high spire, broad subsutural slope, low but strongly tuberculated at the periphery axial folds, and obscure spiral ribs.

Gulf of Aden

The shell is rather small, slender, with high spire comprising about 0.5 of the shell height, yellowish-white, and consisting of 9 whorls. The protoconch is missing. Whorls are strongly angled at the periphery, and the whorl profile is very weakly concave above the angulation and almost flat below it. There is a narrow and weak subsutural fold. Sutures are straight and moderately deep. The axial sculpture consists of slightly oblique and widely spaced folds (9 on each of two last whorls) forming longitudinally elongated and sometimes pointed strong tubercles in the middle of the whorl. On early spire whorls, the folds are obsolete but visible on the lower part of subsutural slope and reach the lower suture. Towards the body whorl, they become obsolete near the lower suture and over most part of subsutural slope, but again become longer and extend over entire shell base in the last half of the body whorl. The last fold situated behind the aperture edge is much wider and stronger than other. Spiral sculpture consists of indistinct, rather broad ribs which are obsolete or subobsolete in interstices between axial folds and absent on the subsutural slope. The aperture is narrow, elongate-oval, with a thick labial callus and straight columella. The labrum has a thin edge and low and narrow fold-like varix behind the edge. The anal sinus is moderately deep. U-shaped, with slightly constricted entrance (type (b) of Kilburn. 1988). There is a moderately large, pointed, and outwardly projecting parietal tubercle. H = 21.3, Hb = 10.7, Ha = 18.4, D = 5.7 mm.