Opisthostoma W. Blanford & H. Blanford, 1860

Opisthostoma W. Blanford & H. Blanford, 1860: 121 . Type SpecieS (by monotypy): Opisthostoma nilgiricum W. Blanford & H. Blanford, 1860 .

Diagnosis. Opisthostoma is characterized by a change in the coiling direction resulting in an aperture pointing towards the upper side or the back of the shell.