Shell pupoid conical, quite solid, which can reach 1.8 x 1 mm with 4.75 whorls. Aperture relatively small, which slightly exceeds 35% of the height. Surface with weak furrows which delimit narrow spiral cords of variable width, between 40 and 50 on the body whorl and between 10 and 20 on the penultimate whorl. The upper spiral cord is somewhat more pronounced and forms a subsutural rim. At high magnification, very tight lamellae can be seen on the cords. Shell colour yellowish, whitish towards the base, with four spiral rows of reddish spots. The upper subsutural row consists of wide square blotches, and the lower one near the base of more diffuse spots. Inside of the outer lip reddish by transparency.
Paucispiral protoconch of 1.5 whorls and 0.33 mm in width (nucleus of 0.92 mm). Sculpture of very irregular and elongated opisthocline strokes that tend to converge into spiral cords. On the basal part of the protoconch, there are irregular granules roughly aligned.

Mainly found in Lanzarote; only one shell collected in Gran Canaria (Canary Islands). All shells were found beached.

This new species is quite similar to C. callosa with which it may have previously been confused. It is distinguished from the latter by having a greater number of spiral cords, narrower and less pronounced. The sculpture of the protoconch also differs in both species. In the new species there are irregular granules roughly aligned in its basal part while in C. callosa the microsculpture is more developed and the granules are thicker.