Revision of Elia (Acroeuxina) 0. Boettger, 1877 (Gastropoda: Clausiliidae)

The species and subspecies of Elia (Acroeuxina) 0. Boettger, 1877 (Gastropoda: Clausiliidae) from NW-Turkey are revised. Three species are distinguished, two of which polytypic, with three and two subspecies, repectively. Three new subspecies are described: E. (A.) huebneri interior; E. (A.) huebneri concava; and E. (A.) retowskii levata. For every taxon the shell is described and illustrated and measurements of several sections of the genitalia are shown. The diagnostic characteristics are summarized in a table. The locality records are listed and the distributions of the taxa displayed on UTM-grid-maps.