Hypselostoma kelantanense ( Sykes, 1902 ), 2025

Hypselostoma kelantanense ( Sykes, 1902) comb. nov.

Figs 224 D View Figure 224 , 228 View Figure 228 , 229 View Figure 229 , 230 View Figure 230 , 241 View Figure 241

Boysidia kelantanense Sykes, 1902: 61, pl. 3, fig. 7.

Boysidia kelantanensis View in CoL — Möllendorff 1902: 139; Pilsbry 1917: 208, pl. 35, figs 10–12.

Paraboysidia kelantanensis View in CoL — Laidlaw 1933: 213–214.

Paraboysidia kelantanensis kelantanensis View in CoL — 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. View in CoL

Paraboysidia kelantanensis tenuidentata van Benthem Jutting, 1950: 15–17, 39, fig. 6. syn. nov. View in CoL

Paraboysidia kelantanensis rafflesi View in CoL — Maassen 2001: 74.

Paraboysidia kelantanensis tenuidentata View in CoL — 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.