[1] The nimapuna tigersnail possesses a thin, ribbed, angular shell that ranges from 11 to 12 mm (0.43 to 0.47 in) in diameter.

[3] The nimapuna tigersnail is the only full species in the Anguispira genus found west of the Rocky Mountains.

This hypothesis aligns with current findings that show that the area serves as a refugium for a number of other rare, narrow-ranged endemics such as Constance's bittercress and the Idaho giant salamander.

[5] In summer and winter, snails may retreat deep into talus refugia to protect themselves from desiccation, freezing, and predators.

Livestock grazing, logging, talus removal, fire suppression, and road construction and maintenance are cited as the most imminent threats to the species' survival.