Turanena (Turanena) elegantula, 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 : 12

Turanena (Turanena) elegantula spec. nov. ( Fig. 5 )

Type locality & type specimens. – Turkey, Vilayet Van, 4 km SE. Göründü, 1650 m (38.3271°N 42.9331°E), H.P.M.G. Menkhorst leg., 21.viii.1992. Holotype NMBE 544664 , paratypes NMBE 544665/1, HMK/>50, RBA/2, RMNH/2, ZMH/2.

Diagnosis. – A slender, spindle-shaped light hornyyellowish coloured Turanena species with a well developed parietal callus, a slightly thickened, not reflected, peristome, and a juxtaposed columellar and palatal insertion of the peristome.

Description. – Shell dextral, elongated spindle-like in outline, with an open, relatively wide, slit-like umbilicus. The 6.5-7.6 whorls are quite convex with a deep suture. Teleoconch with irregular, fine, oblique striae; there are no spiral striae. Shell moderately solid, somewhat translucent, glossy, yellowish to horny-yellowish coloured; there is no whitish band behind the peristome. Aperture elliptical-rounded, peristome not reflected (only slightly at the columellar part) and only slightly thickened. Columellar and palatal insertion connected by a well developed callus (which is often thickened near its ends). A subangularis is not present (the thickened parietal callus does not form a subangularis but normally fuses with the palatal insertion of the peristome). The somewhat oblique columellar ledge reaches halfway to above the middle of the columellar side of the aperture.

Measurements (n = 6). – H = 7.3-9.1 (mean 8.4); LWH = 4.1-4.7 (mean 4.4); MH = 2.2-2.7 (mean 2.4); LWD = 2.9-3.1 (mean 3.0); LWM = 3.0-3.4 (mean 3.2); MD = 1.7-1.9 (mean 1.8); NW = 6.5-7.6 (mean 7.1).

Localities. – Known from the locus typicus only (see above).

Derivatio nominis. – Derived from elegans (graceful, elegant), which relates to the slenderness of the shell.

Differentiation. – Turanena elegantula differs from T. cochlicopoides by its larger size, the more elongated shape, the higher number of whorls, the more prominent parietal callus, and the more clearly thickened peristome. T. conelongata is less slender, the whorls are more convex, the peristome is sharp, the parietal callus is weaker, and the peristome is clearly more reflected at its columellar insertion.

Remarks. – Only a single locality is known for T. elegantula , which is located at the southern shore of Van Gölü. From the same area, T. conelongata and T. zilchi has been described, originally also from a single locality. However, the latter two species have now been recorded from a wider area: T. conelongata from Kozluk (vil. Batman), Baykan (vil. Siirt) and Tatvan (vil. Bitlis) ( Schütt, 2010: 87, 89 fig. e), and T. zilchi from Baykan and Siirt (vil. Siirt), as well as Silvan, Ergani, Eğil, Çatakköprü and Kulp (vil. Diyarbakır) ( Şeşen & Schütt, 2000: 80, fig. 8; Schütt, 2010: 88, 89 figs j+k). We can now add another record of T. zilchi , namely Vilayet Hakkâri, 7 km S. Hakkâri, along the road D400, 1230 m. We here provide a picture ( Fig. 6 ) of this littleknown species, so as to become acquainted with its variability.

Figures

Figs 5 - 7. Turanena taxa from Turkey. 5, Turanena (Turanena) elegantula spec. nov., holotype NMBE 544664 (H = 9.0 mm), Turkey, Vil. Van, 4 km SE. Göründü. 6, Turanena (Turanena) zilchi E. Gittenberger & Menkhorst 1993, NMBE 546171 (H = 6.1 mm), Turkey, Vil. Hakkâri, 7 km S. Hakkâri. 7, Turanena (Turanena) andronakii salpinx subspec. nov., holotype NMBE 546173 (H = 8.1 mm), Turkey, Vil. Artvin, 1 km S. Oruçlu. All photographs Bochud & Neubert, × 8.