Montenegrina helvola ( Kuester , 1860)

Feher, Zoltan & Szekeres, Miklos, 2016, Taxonomic revision of the rock-dwelling door snail genus Montenegrina Boettger, 1877 (Mollusca, Gastropoda, Clausiliidae), ZooKeys 599, pp. 1-137 : 30

Taxon classification Animalia Stylommatophora Clausiliidae

Montenegrina helvola ( Kuester, 1860)

Diagnosis.

Shell small to large, light corneous. Whorls smooth to indistinctly costate. Neck deep inflexed, costate. Basal and peripheral crests strong. Peristome detached, projected, rounded to pear-shaped, with simple margin. Lamellae superior and spiralis long overlap. In front view lamella inferior high-ending, hidden to moderately emerged. Broadly-bent subcolumellaris retracted, not visible through the aperture. Lunella dorsolateral to ventrolateral. Basalis absent to long and fused to the lunella as its almost straight continuation. Subclaustralis absent or short, perpendicular to the lunella. Sulcalis absent or residual. Anterior plica mostly present, separate from the lunella complex. Clausilium plate not or only barely visible through the aperture.