Plectostoma dancei dispersum (Vermeulen, 1994)  

Vermeulen (1994)'s description

"As the type subspecies but spire with (distinctly) convex sides. Whorls 4 1/4 - 4 7/8. Radial ribs not sinuous, on the spire rather closely placed to moderately spaced (6-9 ribs/0.5 mm on the penultimate whorl), on the tuba moderately spaced (4-5 ribs/0.5 mm half-way). Spiral striation absent. Spire: height 1.2-1.5 mm; width 0.9-1.2 mm; index 1.2-1.5. Total width 1.6-2 mm. Height and width aperture 0.4-0.5 mm"