Nineteen new species of Alycaeidae from Myanmar and Thailand (Gastropoda: Caenogastropoda: Cyclophoroidea) Author Páll-Gergely, Barna Author Hunyadi, András 0000-0003-3488-2817 hunand@freemail.hu Author Grego, Jozef 0000-0002-4977-0415 jozef.grego@gmail.com Author Reischütz, Alexander 0000-0002-8844-7004 alexander.reischuetz@gmx.at Author Auffenberg, Kurt 0000-0001-9660-6776 kurtauffenberg@gmail.com text Zootaxa 2021 2021-05-18 4973 1 1 61 journal article 6241 10.11646/zootaxa.4973.1.1 d0967b08-98d1-4ccd-b472-a678e0e57eda 1175-5326 4771958 42EB4BF2-A571-4894-9EEF-783649A27E4F Dicharax ebrius Páll-Gergely & Auffenberg n. sp. Fig. 21 Material examined. Holotype : Thailand , Mae Hong Son Province , 42 km NW of Pai , Road 1095, 19°32’N , 98°32’E , 750 m a.s.l. , 20 Mar. 1988 , K. Auffenberg leg., UF 345577 (D: 2.89 mm , H: 1.97 mm ) . Paratypes : 22 shells, same data as holotype, UF 551221 . Other material: 9 juvenile shells, same data as holotype, UF 551222 . Etymology. The dorsal view of the shell of this new species looks like a face of a drunken ( ebrius in Latin) man due to glossy R3 swelling. Diagnosis. A small Dicharax species with a finely ribbed R1, glossy swelling on R3 situated far from peristome, thickened outer peristome and slightly fringed inner peristome. Description. Shell off-white to yellowish corneous, slightly translucent; shell outline slightly oval in dorsal view; spire slightly elevated, low conical, body whorl rounded; protoconch low, glossy, 1.25–1.5 whorls; R1 of 1.75–2 whorls, finely, regularly ribbed from beginning, ribs gradually become more widely-spaced toward R1 termination; boundary between R1 and R2 conspicuous due to dense R2 ribs; R2 ribs curved toward aperture, ca. 44–46 ribs present; R2 ribs almost adnate; R2+R3 slightly more than quarter whorl (ca. 100˚); R2 approximately as long as R3 or slightly shorter; boundary between R2 and R3 distinct due to change in sculpture and deep constriction; R3 with prominent, but rounded, glossy swelling situated close to constriction; between swelling and peristome with few fine ribs, in some specimens this area slightly swollen, seemingly forming secondary swelling; aperture strongly oblique to shell axis, rounded with basal incision; boundary between inner and outer peristomes indistinct; inner peristome strong, protruding, expanded, basal and palatal portions slightly fringed, outer peristome expanded, and reflected toward umbilicus; peristome edges merge to form a multi-layered, thickened apertural lip; umbilicus narrow, approximately one fourth of shell width. Measurements. D: 2.65–2.89 mm , H: 1.85–1.97 mm . Operculum. Outer surface concave, yellowish corneous, with some traces of a deciduous lamina; inner surface with a small, pointed, low central nipple. Differential diagnosis. The small shell size, blunt, but prominent, glossy swelling on R3 makes this new species easy to recognize. Dicharax notus (Godwin-Austen, 1914) is similar in overall shell shape, but has blunter, less glossy R3 swelling situated closer to peristome and a rounded aperture. Due to the weak traces of lower, secondary R3 swelling and overall shell shape, this new species is similar to D. birugosus (Godwin-Austen, 1893) (syn. Alycaeus canaliculus Godwin-Austen, 1914 , see Páll-Gergely et al . 2020 ) from the Khasi Hills, India . However, the Indian species has shorter R2 and R3, the R2 ribs are more widely-spaced, and prominent secondary swelling. Distribution. This new species is known only from the type locality ( Fig. 17 ).