AULACOPHAEDUSA AZUMA, 1982

Motochin, Risho, Wang, Min & Ueshima, Rei, 2017, Molecular phylogeny, frequent parallel evolution and new system of Japanese clausiliid land snails (Gastropoda: Stylommatophora), Zoological Journal of the Linnean Society 181, pp. 795-845 : 828

SUBGENUS AULACOPHAEDUSA AZUMA, 1982 [= SUBCLADE B6 + M. (A.) ARATRUM (PILSBRY, 1903)]

Type species: Clausilia gracilispira Moellendorff, 1882

Diagnosis: Shell small and thin. Parietal margin of the aperture with a longitudinal groove just beside the superior lamella or not. Plicae and clausilium located laterally to ventro-laterally. Lunella present or absent. Upper and lower palatal plicae always present. Distribution: endemic to Western Honshu, Shikoku and Kyusyu.

Morphology: Apex pointed. Superior lamella developed. Inferior lamella receded. Principal plica developed. Middle palatal plica(e) absent. Clausilium narrow. Diverticulum of bursa copulatrix developed. See also Diagnosis.