Imparietula inflexa, Ruud, A. Bank, Henk P. M. G Menkhorst & Eike Neubert, 2016

Ruud, A. Bank, Henk P. M. G Menkhorst & Eike Neubert, 2016, Descriptions of new and little-known land snail taxa from Turkey, and establishment of a new genus (Gastropoda, Pulmonata: Lauriidae, Enidae and Vitrinidae), Basteria 80 (1), pp. 5-30 : 14

Imparietula inflexa spec. nov. ( Fig. 20 )

Type locality & type specimens. – Turkey, Vilayet Giresun, 5 km N. Tamdere (= S. Yavuzkemal) , 1430 m (40.5397°N 38.3575°E),

H.P.M.G. Menkhorst leg., 6.viii.1992. Holotype NMBE 544683 .

Diagnosis. – A small, hornbrown coloured Imparietula species with a granulated sculpture, a strong palatalis superior and a biarcuate last whorl.

Description. – Shell dextral, spindle-shaped in outline, with an open, slit-like umbilicus. The 7.9-8.1 whorls are convex with a rather deep suture. Teleoconch with irregular, dense, rather pronounced, oblique striae crossed by irregular, indistinct, incised spiral striae producing a granulated sculpture. Shell fairly solid, not translucent, dull, hornbrown coloured, with a whitish band behind the peristome. Peristome reflected, thickened by a labial callus, the columellar and palatal insertion connected by a thin callus, which is thickened near its ends. The thickening of the parietal callus at the palatal insertion of the peristome resembles a subangularis . A prominent palatalis superior is present. The last whorl is biarcuate, being strongly looped inward the middle; there is a prominent impression at the palatalis superior. The columellar ledge reaches halfway of the columellar side of the aperture. There is an additional thickening running from the insertion of the columellar ledge to the basal part of the peristome.

Measurements (n = 3). – H = 12.3-12.8 (mean 12.6); LWH = 5.9-6.5 (mean 6.3); MH = 3.8-4.3 (mean 4.0); LWD = 4.3-4.7 (mean 4.4); LWM = 4.2-4.6 (mean 4.4); MD = 2.9-3.1 (mean 3.0); NW = 7.9-8.1 (mean 8.0).

Localities. – Vilayet Giresun: type locality (see above); 6 km N. Tamdere (HMK/1); Giresun, 75 km towards Şebinkarahisar, 1500 m (NMBE/1).

Derivatio nominis. – Named after the inwards curved aperture near the palatalis superior.

Differentiation. – I. inflexa differs from I. pelidne by its dimensions, the stronger palatalis superior, the biarcuate last whorl, and the additional thickening inside the aperture at the columellar-basal margin. I. leucodon also has a prominent palatalis superior, but it differs from I. inflexa by its dimensions, the less biarcuate last whorl, the less pronounced oblique striae and the less pronounced granulation, the much stronger developed parietal callus, and the absence of an additional thickening in the aperture at the columellar-basal margin.

Remarks. – The description is based on only three specimens, none of them being well-preserved.

Figures

Figs 16 - 20. Multidentula and Imparietula taxa from Turkey. 16, Multidentula squalina squalina (L. Pfeiffer, 1848), NMBE 548313 (H = 7.8 mm), Turkey, Vil. Karabük, eastern part Eskipazar, leg. Hausdorf, 27. ix. 1987. 17, Multidentula squalina eudoxina (Nägele, 1894), paralectotype SMF 14195 a coll. Kobelt ex Nägele (H = 6.3 mm), Turkey, Vil. Tokat, Tokat. 18, Multidentula squalina acutior (Lindholm, 1922), NMBE 544678 (H = 5.7 mm), Turkey, Vil. Artvin, N. Kınalıçam (= NNW. Cağliyan). 19, Multidentula reducta spec. nov., holotype NMBE 544681 (H = 6.2 mm), Turkey, Vil. Sivas, Zara, 16 km towards Imranlı. 20, Imparietula inflexa spec. nov., holotype NMBE 544683 (H = 12, 4 mm), Turkey, Vil. Giresun, 5 km N. Tamdere (= S. Yavuzkemal). All photographs Bochud & Neubert, × 8.