Colour variations of Tandonia nigra. A greyish morph from Rovio, waterfall at Botto, NMBE 568980 B, C topotype from summit area; NMBE 569047 D Mendrisio, Val Cürta, NMBE 570972 E Capolago, Val Cürta, NMBE 570971 F Rovio, Sasso Piatto, NMBE 570974.

 
 
  Part of: Schallenberg VM, Heim R, Schneppat UE, Müller P, Rüetschi J, Neubert E (2022) Revision of the family Milacidae from Switzerland (Mollusca, Eupulmonata, Parmacelloidea). ZooKeys 1116: 149-179. https://doi.org/10.3897/zookeys.1116.82762