Turanena (Turanena) elegantula Ruud, Menkhorst &amp; Neubert, 2016, spec. nov.
Creators: name: Ruud, A. Bank
name: Menkhorst, Henk P. M. G
name: Neubert, Eike
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Stylommatophora
Enidae
Turanena
Turanena elegantula

description: <i>Turanena</i> (<i>Turanena</i>) <i>elegantula</i> spec. nov. (Fig. 5) Type locality &amp; 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/&gt;50, RBA/2, RMNH/2, ZMH/2. Diagnosis. – A slender, spindle-shaped light hornyyellowish coloured <i>Turanena</i> 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 <i>elegans</i> (graceful, elegant), which relates to the slenderness of the shell. Differentiation. – <i>Turanena elegantula</i> differs from <i>T. cochlicopoides</i> by its larger size, the more elongated shape, the higher number of whorls, the more prominent parietal callus, and the more clearly thickened peristome. <i>T. conelongata</i> 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 <i>T. elegantula</i>, which is located at the southern shore of Van Gölü. From the same area, <i>T. conelongata</i> and <i>T. zilchi</i> has been described, originally also from a single locality. However, the latter two species have now been recorded from a wider area: <i>T. conelongata</i> from Kozluk (vil. Batman), Baykan (vil. Siirt) and Tatvan (vil. Bitlis) (Schütt, 2010: 87, 89 fig. e), and <i>T. zilchi</i> from Baykan and Siirt (vil. Siirt), as well as Silvan, Ergani, E&amp;gbreve;il, Çatakköprü and Kulp (vil. Diyarbak&amp;imath;r) (&amp;Scedil;e&amp;scedil;en &amp; Schütt, 2000: 80, fig. 8; Schütt, 2010: 88, 89 figs j+k). We can now add another record of <i>T. zilchi</i>, 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.
description: Published as part of <i>Ruud, A. Bank, Henk P. M. G Menkhorst &amp; 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), pp. 5-30 in Basteria 80 (1)</i> on page 12, DOI: 10.5281/zenodo.439745
description: {"references": ["SCHUTT, H., 2010. Turkish land snails 1758 - 2005. 5 th, revised edition with colour photos: 1 - 559. Verlag Natur &amp; Wissenschaft, Solingen.", "SESEN, R. &amp; SCHUTT, H., 2000. Land snails from Sason Mountains in Siirt province in eastern Anatolia. - Zoology in the Middle East 20: 77 - 84."]}