Helix (Patula) rupestris chorismenostoma Westerlund & Blanc, 1879 Pyramidula rupestris chorismenostoma Pyramidula chorismenostoma is a species of very small air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Pyramidulidae.

The normal condition of the shell of this species is scalarid, i.e. the whorls of the shell are not attached to one another.

This shell type is unique among the non-marine malacofauna of Europe.

[2] This species occurs in countries and islands including:

This Pyramidulidae-related article is a stub.