Rhiostoma chupingense Tomlin, 1938
Tomlin (1938) original descriptions on Rhiostoma chupingense – “Whorls five, the last one bent noticeably downwards out of the plane of the earlier whorls, the rest of the shell flattish with spire slightly raised, widely umbilicate, sutures well marked; shell smooth but for regular growth-lines; colour (of holotype) light brown with a sharply defined subperipheral band of darker brown about ½ mm in width; aperture circular, peristome in adult moderately thickened and splayed out, operculum of the normal Rhiostoma type. The colour of this species is variable; one example in the type lot as bandless and a very pale yellowish; another is very dark brown through which the band shows faintly.”
“Diam. max. (including the disconnected whorl), 25 mm.; alt., 9 mm.; Diameter of aperture 8 mm.” (Tomlin, 1938)
Type locality – “Bukit Chuping, Perlis” leg. M. W. F. Tweedie/Mar. 1936 (Tomlin, 1938)