Parmacella valenciennii is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Parmacellidae.

[2] The shell is yellow, triangular, fragile and flat, with 1.5 whorls.

[2] Parmacella valenciennii differs anatomically from all other Parmacella species by a single, characteristically horn-shaped and almost straight accessory atrial appendix.

[2] Parmacella valenciennii lives in stony open habitats, preferring shady and humid sites between plants and stones.

[2] This article incorporates public domain text from the reference.