The terrestrial microsnail genus Aulacospira Moellendorff, 1890 (Eupulmonata, Stylommatophora, Hypselostomatidae) in Thailand with key to Thai species Author Dumrongrojwattana, Pongrat Department of Biology, Faculty of Science, Burapha University, Bangsaen, Chonburi 20131 Thailand https://orcid.org/0000-0002-2544-6979 oldsnails@hotmail.com Author Tanmuangpak, Kitti Program of Biology, Department of Science, Faculty of Science and Technology, Loei Rajabhat University, Loei 42000 Thailand text ZooKeys 2020 980 23 42 http://dx.doi.org/10.3897/zookeys.980.54100 journal article http://dx.doi.org/10.3897/zookeys.980.54100 1313-2970-980-23 78EED563089C4804A91087DAF1B3D2EB FD77063CAE3F5DDFA5D3A7714A674E83 Aulacospira smaesarnensis Panha & Burch, 2001 Figures 2F , 3D Aulacospira smaesarnensis Panha and Burch 2001 : 65, fig. 2. Type locality. Thailand, Smaesarn Village, a fishery village located in an isolated liestone hill of Chonburi Province; 12°34'06"N , 100°56'578"E. Types examined. ZRCBUU 0370 (10 shells); Thailand, Smaesarn Village, a fishery village located in an isolated liestone hill of Chonburi Province; 12°34'06"N , 100°56'578"E; 12.v.2013; leg. Dumrongrojwattana, P. ZRCBUU 0425 (10 shells); Thailand, Smaesarn Village, a fishery village located in an isolated limestone hill of Chonburi Province; 12°34'06"N , 100°56'578"E; 20.iii.2015; leg. Dumrongrojwattana, P. Measurements. H = 2.47-2.83 mm, W = 1.45-1.70 mm. Diagnosis. Shell minute, helicoid, moderately elevated spire; brownish. Protoconch smooth; teleoconch rough; body whorl large, rounded peripherally; tuba projecting downward; peristome thickened and expanded; aperture with poorly developed barriers, parietal lamella palatal plica and columellar lamella (Fig. 2F ). Radula. As in A. depressa (Fig. 3D ). Reproductive anatomy. Unknown. Distribution. This species appears limited to the type locality (Fig. 1 ).