Amastra subobscura

The length of the shell attains 11.9 mm, its diameter 6 mm.

(Original description) The shell contains 6 whorls. The shell is minutely perforate, oblong-conic, and relatively thin with a slight sheen. The spire's outlines are nearly straight. The whorls of the protoconch are reddish-brown, with a smooth initial half-whorl followed by a coarsely costate whorl that is carinated just above the suture. The subsequent whorl is finely and densely costulate, with a subtle angularity near the lower suture.

The later whorls are convex, adorned with growth wrinkles and subplicate ridges just below the suture. They are pale fleshy-gray, partially covered by a very thin, smooth olivaceous cuticle, which is darkest on the latter half of the body whorl and absent near the aperture.

The aperture is pinkish-white, with the outer lip remaining unthickened. The parietal callus is whitish and moderately thick.^[2]

This species is endemic to Hawaii, occurring on Molokai Island.

• Cowie, R. H., Evenhuis, N. L. & Christensen, C. C. (1995). Catalog of the native land and freshwater molluscs of the Hawaiian Islands. vi. Leiden: Backhuys Publishers. p. 107.{{cite book}}: CS1 maint: multiple names: authors list (link)