Hypselostoma kelantanense Gojšina & Hunyadi & Sutcharit & Tongkerd & Auffenberg & Grego & Vermeulen & Reischütz & Páll-Gergely 2025, comb. nov.

Hypselostoma kelantanense (Sykes, 1902) comb. nov. Figs 224 D, 228, 229, 230, 241 Boysidia kelantanense Sykes, 1902: 61, pl. 3, fig. 7. Boysidia kelantanensis — Möllendorff 1902: 139; Pilsbry 1917: 208, pl. 35, figs 10–12. Paraboysidia kelantanensis — Laidlaw 1933: 213–214. Paraboysidia kelantanensis kelantanensis — van Benthem Jutting 1950: 12–13, 39, fig. 4; Maassen 2001: 74. Paraboysidia kelantanensis rafflesi van Benthem Jutting, 1950: 13–14, 39, fig. 5. syn. nov. Paraboysidia kelantanensis tenuidentata van Benthem Jutting, 1950: 15–17, 39, fig. 6. syn. nov. Paraboysidia kelantanensis rafflesi — Maassen 2001: 74. Paraboysidia kelantanensis tenuidentata — Maassen 2001: 74. Type material examined. Malaysia • 1 syntype of Paraboysidia kelantanensis kelantanensis; NHMUK 1930.9. 12.13–15 • syntypes of Paraboysidia kelantanensis kelantanensis; Kelantan; UF 00113222 • 4 paratypes of Paraboysidia kelantanensis rafflesi; from the type locality; 1947; Raffles Museum, Singapore ex. coll.; RMNH.Moll.137125 • 1 paratype of Paraboysidia kelantanensis tenuidentata; from the type locality; Mar. 1939; Raffles Museum, Singapore ex. coll.; RMNH.Moll.137127. Syntypes of Paraboysidia kelantanensis kelantanensis; ANSP 98191. Type localities. “ Kelantan ”, Malaysia (H. kelantanensis kelantanensis); “ Kota Tongkat, Pahang ”, Malaysia (H. kelantanensis rafflesi); “ Kramat Pulai, Perak ”, Malaysia (H. kelantanensis tenuidentata). Differential diagnosis. This species is in terms of apertural dentition and surface sculpture similar to H. frequens. However, it has a more rounded shell with more bulging whorls and narrower umbilicus than previous species. See also under H. serpa. Distribution. This species is known from Kelantan, Pahang, and Perak provinces in Peninsular Malaysia. Remarks. We observed no crucial differences between the two subspecies described by van Benthem Jutting (1950) and the nominotypical subspecies. Furthermore, one paratype of P. kelantanensis rafflesi had the identical shell morphology as that of P. kelantanensis tenuidentata which indicates that the differences mentioned by van Benthem Jutting (1950) (strength of the apertural barriers and overall shell shape) can be considered as a part of intraspecific variability. Some of the examined type specimens are more slender than others. Additionally, some of them had a small lamella between parietal and columellar, while some of them did not.