Caucasocressa planospira Hausdorf and Falkner, 2001

Hausdorf, Bernhard, 2003, Revision of the genus Caucasocressa from the eastern Pontic Region (Gastropoda: Hygromiidae), Journal of Natural History 37 (21), pp. 2627-2646 : 2641

Caucasocressa planospira Hausdorf and Falkner, 2001

(figures 2, 16) Caucasocressa planospira Hausdorf and Falkner, 2001: 47 , pl. 6, fig. 5. Type locality: ‘Vil.

Artvin: Demirkent, road towards the summer camp Salekör (west of Demirkent),

hazel-trees, GF32’, Turkey.

Shell (figure 16). Disc-like; with 4–4.75 convex whorls; teleoconch with wrinkled growth ridges and (about 1 mm) long hairs; brownish corneus, with a brownish band below the periphery and one above the periphery; body whorl rounded; aperture almost circular; upper insertion of the peristome distinctly descending; peristome sharp, hardly expanded, with a more or less strong whitish internal rib; umbilicus wide, taking about 20% of the shell breadth.

Measurements. Holotype: D= 11.7 mm, H= 5.9 mm, D/H=1.98; paratype: D= 13.9 mm, H= 7.8 mm; D/H=1.78.

Remarks. Caucasocressa planospira differs from the other Caucasocressa species in the small, flat, brownish shell with long hairs. The holotype was already dead, when it was preserved. Because the copulatory organs were partly turned out, they could not be measured completely. The ratio epiphallus: flagellum is 2.8.

Distribution and material (figure 2). Caucasocressa planospira is known only from the mountains near Demirkent.

Turkey: V . Artvin: Demirkent, road towards the summer camp Salekör (west of Demirkent ), hazel trees, GF32 (det. anat.; holotype ZMH 2886 ; paratype ZMH 2887 ) .