Parmacella valenciennii

The animal is brownish red to brownish olive, with black bands on the mantle.^[2] Adult specimens are lighter.^[2] The body is sharply keeled in the posterior section.^[2] The mantle length in young animals is about 3/4 of the body length.^[2] The mantle is rounded in the anterior part and pointed in posterior part.^[2] The animal is up to 100 mm long, usually 70–80 mm long and 20 mm in width.^[2]

The shell is yellow, triangular, fragile and flat, with 1.5 whorls.^[2] The length of the shell is 15 mm, 9 mm in width and 2–3 mm high.^[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] The animals move slowly.^[2]

There is a high abundance of these animals in the spring;^[2] the animals were so abundant that they were formerly used as pig food in southern Portugal.^[2]

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