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 Chamalycaeus erawan Páll-Gergely & Hunyadi n. sp. Fig. 4 Material examined. Holotype : Thailand , Kanchanaburi Province , Erawan National Park , Erawan Falls Trail , 14°22.310’N , 99°8.699’E , 90 m a.s.l. (locality code: 2015/28), 17 Feb. 2015 , A. Hunyadi leg., HNHM 104869 (D: 2.45 mm , H: 1.53 mm ) . Paratypes : 4 shells, same data as for holotype, HA ; 1 shell, Thailand , Kanchanaburi Province , 4.3 km SW Kanchanaburi , Taoist Buddhist temple, 13°59’N , 99°31’E , 40 m a.s.l. , 13 May 1988 , K. Auffenberg leg., litter sample, UF 345935 . Etymology. The specific epithet refers to the type locality (Erawan National Park). Diagnosis. A small Chamalycaeus species with bluntly angled body whorl, short R2, rounded aperture, and strongly expanded outer peristome. Description. Shell off-white to light grey, rather glossy, very slightly translucent; shell outline slightly oval in dorsal view; spire slightly elevated, conical-domed; body whorl rather bluntly angled, depressed inward basolaterally in apertural view; protoconch rather low, glossy, spiral striae lacking, 1.25–1.5 whorls; R1 of 1.5–1.75 whorls, with irregular, narrow, but rather low ribs and some weak spiral striation; boundary between R1 and R2 not distinct, but visible due to change in rib density; R2+R3 approximately a quarter whorl; R2 short, about one third of R3 length, only ca. 14–16 ribs; R2 ribs low, dorsally rounded; boundary between R2 and R3 distinct due to moderately deep constriction and almost smooth early R3; R3 with elongated, almost smooth (only a few low riblets/growth lines) central swelling; aperture oblique to shell axis, round; distance between inner and outer peristomes conspicuous, inner peristome protruding, thin, but robust, and slightly expanded; outer peristome strongly expanded, but not reflected, reduced in umbilical area; umbilicus narrow, less than one third shell width. Measurements. D: 2.25–2.45 mm , H: 1.49–1.56 mm . Operculum. Unknown. Differential diagnosis. This new species differs from Chamalycaeus irmatallus n. sp. in the larger size, longer R3, and more expanded peristome. Distribution. This species is known only from two nearby localities ( Fig. 5 ).