Shell solid, with numerous spiral cords and ribs. Protoconch with about 1 whorl; nucleus of 160 µm and a diameter of 410 µm. With 2 spiral cords at the beginning of the teleoconch, but immediately 3 more depressed cords are added; 7 cords on the second and 7-8 on the penultimate 7-8 whorl. The last whorl has 13 spiral cords on the upper part, which are smaller below, whereas there are 4-5 more near the base. The aperture is ovoid, with a deep siphonal canal below, and no internal nodules. The external part of the aperture is wide and extended, with about 13 spiral prominences, which are the ends of the spiral cords. Peristome sharp. Columella curved, with a thickened callus. The microsculpture is formed by very small axial striae which do not cross the spiral cords. The interspaces between the cords are small. Dimensions: Up to 4 mm high.

Lee (2003) mistakenly synonymized this species with S. houbricki. The differences between this species and the other species from the western Atlantic are: (1) the slightly wider protoconch, (2) the more numerous spiral cords, which are narrower and more narrowly spaced, (3) the more numerous nodules on the external lip, (4) the wider external lip, and (5) the more convex teleoconch whorls.

Only known from Cuba.