Valvata kebapcii, Odabaşi & Glöer & Yildirim, 2015

Odabaşi, Deniz Anil, Glöer, Peter & Yildirim, M. Zeki, 2015, The Valvata Species of Turkey with a Description of Valvata kebapcii n. sp. (Mollusca: Valvatidae), Ecologica Montenegrina 2 (2), pp. 135-142 : 137-138

Valvata kebapcii sp. n.

( Figs 2-5)

Material examined. 65 ex. from Tuzla Stream nearby Korubaşı and Tuzla villages; 39°31'30.8264" N 26°17'9.57" E, 81 m alt. and 39°33'29.3714" N, 26°17'9.57" E, 17 m alt. respectively, 20.03.2011, Deniz Anıl Odabaşı & Serpil Odabaşı leg.

Additional material examined. 5 ex. from Cire Brook; 37°47'26.31" N, 30°52'21.78" E, 06.05.1997, M. Z. Yıldırım leg.

Holotype. Shell height 2.47 mm, width 3.86 mm, COMULM–G 0050.

Paratypes. 5 ex. COMULM–G 0051, remainder in coll. D. A. Odabaşı.

Locus typicus. Turkey, northwestern Anatolia, Ayvacık town , Tuzla Stream, 39°31'30.8264" N, 26°17'9.57" E, 81 m alt .

Etymology. The new species is named after Dr. Ümit Kebapçı (MAEÜ, Burdur), outstanding expert on continental molluscs of Turkey.

Description

The horn-colored shell has 3½ circular whorls with a low spire and a blunt apex. The surface is densely covered by regular-silky ribs. Shell height up to 2.6 mm, diameter 3.5 - 4.0 mm. The umbilicus is wide, shell diameter to diameter of umbilicus about 0.25. The aperture is circular and slightly angulated at the top. The concave operculum, identical with that of V. piscinalis , is thin, nearly circular and has dextral whorls with dense silky spiral striae. The last whorl of the operculum is apparently wider than the penultimate and has oblique growth lines near the end together with the striae.

Anatomy. Head is light brown pigmented that confined to the basis of penis and snout. The pigmentation could be extended up to the half of snout in some individuals. The tentacles are white.

Differential diagnosis. The aperture of the new species is slightly angulated at the top unlike V. cristata and Valvata macrostoma , the aperture of which is circular without any angle. Valvata kebapcii sp. n. could be separated from Valvata piscinalis and V. saulcyi by its larger umbilicus and from V. cristata by its higher spire. In V. kepbapcii sp. n. the spire is higher and the umbilicus is wider than in the Pleistocene V. beysehirensis .

Distribution. Tuzla Stream, Dümrek Brook and Karamenderes Stream (Ayvacık and Ezine towns) of Çanakkale Province, Turkey. Cire Brook, South of Lake Eğirdir, Isparta.

Ecology. The Tuzla Stream rises from the southern slopes of Kaz Dağı (National Park established in 1993) on the Biga Peninsula, northwestern Turkey ( Demirsoy et al. 2005) ( Fig. 1). The stream is rather shallow but flows year- round with lush vegetation on a coarse-sand substrate ( Fig. 13). Seasonal waste discharges have been observed near the sampling station in the olive harvest season. The accompanying freshwater snails were Pseudobithynia yildirimi Odabaşı, Kebapçı & Akbulut, 2013 , Melanopsis buccinoidea (Oliver 1801) , Physa acuta (Draparnaud 1805) , Gyraulus piscinarum (Bourguignat 1852) , and Planorbis intermixtus Mousson 1874 . According to our data, Valvata kebapcii n. sp. inhabits a restricted location in the Tuzla Stream and some other localities in the Biga Peninsula i.e. lowland points on Dümrek Brook and Karamenderes stream. According to the field observations and considering the paper of Odabaşı et al. (2013) in the type locality, wastes of an olive oil mill set up nearby the stream has been threatening the aquatic life especially prosobranch gastropods in some seasons.