The freshwater snails (Gastropoda) of Iran, with descriptions of two new genera and eight new species Author Gloeer, Peter Biodiversity Research Laboratory, Schulstrasse 3, D- 25491 Hetlingen, Germany Author Pesic, Vladimir Department of Biology, Faculty of Sciences, University of Montenegro, Cetinjski put b. b., 81000 Podgorica, Montenegro text ZooKeys 2012 2012-09-04 219 11 61 http://dx.doi.org/10.3897/zookeys.219.3406 journal article http://dx.doi.org/10.3897/zookeys.219.3406 1313-2970-219-11 35A0EBEF815740B5BE499DBD7B273918 FFE7FFDBAA3AFF8BF81AFFD7FFCDFF87 577535 Bithynia (Bithynia) forcarti sp. n. Figs 5a-b Type locality. Mazandaran Province, Tschalekuti. Holotype (NMB 11517a): shell height 7.5 mm, width 5.6 mm. Paratypes. Mazandaran Province, Tschalekuti (NMB 11517a, 26 ex.), Geniste d. Babul (NMB 11517b, 1 ex., NMB 11571c, 10 ex.) Etymology. Named after Lothar Forcart in appreciation on his studies of Iranian freshwater snails. Description. The whitish shell is conical with 5.5 whorls, which are convex with a deep suture and a small and acute apex. The convex whorls are flattened at the suture. The umbilicus is open. The aperture is ovate, angled at the top. The margin of the aperture is, from lateral view, slightly sinuated. The surface is smooth with fine growth lines. Shell height 5.5 - 7.5 mm, width 5.0 - 5.6 mm. Differentiating features. Due to theshape of the aperture (angled at the top), Bithynia forcarti sp. n. resembles Bithynia mazandaranensis sp. n. (see below). However, from the latter species it can be easily distinguished by the stepped whorls. Remarks. Formerly ( Forcart 1935 ) this species has been confused with Bithynia tentaculata .