A new species and a new subspecies of Laotia Saurin, 1953 (Gastropoda: Caenogastropoda: Alycaeidae) from Sơn La Province, Vietnam Author Páll-Gergely, Barna Author Hunyadi, András text Raffles Bulletin of Zoology 2021 2021-05-07 69 118 123 journal article 10.26107/RBZ-2021-0010 2345-7600 5351956 DD656B82-2FF6-444F-B259-827EDC7F3715 Laotia christahemmenae phami , new subspecies ( Fig. 1B–D ) Type material. Holotype (VNMN-Z-Inv.000218, D: 5.1 mm , H: 3.5 mm ), Vietnam , SƠn La Province , Thu ận Châu District , Co M ạ, Pha Khuȏng , rock wall above Chuyên Nga Motel , 1,270 m a.s.l. , 21°21.385′N , 103°31.175′E (locality code: 2020/17), coll. A. Hunyadi , H. V . Luong, J.U . Otani & S. V . Pham , 8 February 2020 . Paratypes . 1 shell (VNMN-Z-Inv.000219), same data as holotype ; 9 shells (coll. HA), same data as holotype ; 1 paratype with operculum (photographed), (coll. HA), same data as holotype ; 5 adult dead shells (coll. JUO ), same data as holotype ; 2 adult dead shells (coll. JUO ), Vietnam , SƠn La Province , Thu ận Châu District , Co M ạ, Pha Khuȏng , along rd. 108, 1,260 m a.s.l. , 21°21.36′N , 103°31.4526′E (locality code: 20200208B), coll. A. Hunyadi , H. V . Luong, J.U . Otani & S. V . Pham , 8 February 2020 . Additional material. 1 juvenile shell (coll. HA), same data as holotype . Differential diagnosis. This subspecies differs from the nominotypical subspecies in the more elevated spire and the narrower umbilicus (umbilicus width ca. one fifth of the small shell diameter in the new subspecies, whereas it is ca. one fourth in the nominotypical subspecies). Measurements (in mm). D: 4.9–5.3, H: 3.5 (smallest and largest shells measured). Operculum. Outer side: funnel shaped with a single, multispiral calcareous lamina bent towards the nucleus. Inner side: glossy, without central nipple, with shallow, wide spiral grooves corresponding with the position of the elevated lamina of the outer side. This is the first report of an operculum in Laotia . Etymology. This new species is dedicated to and named after our much-valued friend, Sáng Văn Phạm, who helped during field collection. Distribution. Laotia christahemmenae phami , new subspecies , is known from two nearby occurring localities in SƠn La Province , Vietnam ( Fig. 2 ). Practically a single population is known. RAFFLES BULLETIN OF ZOOLOGY 2021