The small shell is turreted with rounded whorls. The sculpture of the teleoconch consists of sharp axial ribs crossed by fine spiral lines forming a reticulate pattern. The protoconch consists of an inflated embryonic part and a larval shell sculptured by very fine spiral lines.
Description: The up to 1.4 mm high turreted shell consists of 2.5 rounded teleoconch-whorls sculptured with nine sharp axial ribs on the first teleoconch-whorl. These are crossed by numerous fine spiral lines forming a reticulate pattern. The aperture is rounded, the umbilicus narrow. The protoconch consists of 3.5 rounded whorls reaching a hight of 0.32 mm. The initial cap measures 0.05 mm in width. The inflated embryonic shell of one whorl is smooth and measures 0.13 mm in diameter. The larval shell is characterized by the onset of six very fine spiral lines. It is terminated by a well developed sinusigera notch.

This species differs from the type,C.elegans,by having stronger developed axial ribs which dominate considerably over the spiral element. Another difference lies in the smaller size of C. acutocostata n. sp.. The protoconch of the species representing a planktotrophic veliger stage is of typical vanikorid sculpture especially close to that of Macromphalus and Micromphalina. The latter is also similar regarding the shape of the teleoconch but differs in its less pronounced axial sculpture and in its ovate aperture.