111 Arch. Molluskenkunde 125 I (1/2) I 111-112 Frankfurt am Main, 15. 1. 1996 Leistyla nemethi n. sp. from the Northwestern Caucasus (Gastropoda: Pulmonata: Lauriidae) BERNHARD HAUSDORF With 1 figure Abstract Leiostyla nemethi n. sp. is described from the Northwestern Caucasus. Key words: Taxonomy, Leiostyla, new species, Northwestern Caucasus. Kurzfassung Leiostyla nemethi n. sp. wird aus dem nordwestlichen Kaukasus neu beschrieben. Schlusselworter: Taxonomie, Leiostyla, neue Art, nordwestlicher Kaukasus. The Caucasus region and the Macaronesian Islands are callus connecting the angularis-spiralis with the insertion the areas with the highest recent diversity of Leiostyla of the palatal wall. species (PILSBRY 1922-1923). Although our knowledge about the Leiostyla of the Caucasus region increased con­ SheII (Fig. 1): Slowly tapering subcylindrical; per­ siderably in the last decade (GITTENBERGER & PIEPER 1988; forate; finely striated; brown; subtranslucent; 7 3/4-8 HAUSDORF 1990; POKRYSZKO 1991; SCHILEYKO 1984, 1988; moderately inflated whorls separated by a slightly impress­ SUVOROV & SCHILEYKO 1991), new species are still being ed suture; body whorl ascending towards the aperture, discovered. In the following a new Leiostyla species from with a low basal crest delimited by an incision; aperture the Northwestern Caucasus is described which is strikingly ovate; peristome slightly expanded, reflected and strengthe­ different from all known Leiostyla species. ned by a thick lip distinctly indented in its uppermost sec­ tion; at the palatal wall there is a very long and strong palatalis inferior in the middle which fuses anteriorly with Leiostyla nemethi n. sp. the lip, and a short infrapalatalis which does not reach to the lip; in the specimen from the Hosta valley the in­ Derivatio nominis: The species is named in honour of frapalatalis is reduced; opposite to the palatalis inferior Mr. LASZL6 NEMETH, Budapest, who discovered ist. there is a prominent columellaris in the middle of the D i a g nos is: A Leiostyla species characterized by a columellar edge; at the parietal wall there is a compara­ subcylindrical, finely striated shell with a basal crest, a long tively low parietal is and a very high angularis-spiralis palatalis inferior anteriorly fused with the lip and a high which is connected with the insertion of the palatal wall Address of the author: BERNHARD HAUSDORF, Zoologisches Institut und Museum der Universitat Hamburg, Martin-Luther-King­ Platz 3, D-20146 Hamburg, Germany. DOI:10.1127/arch.moll/125/1996/111 (c) 2015 www.schweizerbart.com.