The native distribution of Bulimulus tenuissimus includes:
- Brazil – widespread in Brazil
The non-indigenous distribution includes:
- North Carolina, USA
The shell is perforate, ovate-conic, very thin, pellucid, scarcely shining, obsoletely and closely decussated by growth striae and delicate spiral lines. The shell is pale corneous in color, sometimes fulvous. The spire is conoid. The apex is rather acute. The suture is simple. The shell has six whorls that are slightly convex, increasing with moderate rapidity. The last whorl is convex, not descending in front, somewhat attenuated at base. The columella is suboblique, sometimes nearly vertical.
The aperture is oval, colored like the exterior, onehalf the shell’s length. The peristome is simple, unexpanded, acute. The right margin is regularly arcuate. The columellar margin is reflexed above, nearly covering the perforation.
The width of the shell is 9 mm. The height of the shell is 17 mm.