Hypselostoma pendulum (Panha & J. B Burch, 2002) comb. nov.

Figs 242 F, 255, 259

Antroapiculus pendulus Panha & Burch, 2002 a: 144–148, figs 2, 3.

Anthroapiculus pendulus [sic] — Dumrongrojwattana and Wongkamhaeng 2024: 323, fig. 7.

Type material examined.

Thailand • 1 paratype; from the type locality; May 1998.; S. Panha, J. B. Burch, P. Dumrongrojwattana, C. Sutcharit, S. Tumpeesuwan, P. Tongkerd, W. Wanarat, S. Klomtong leg.; CUMZ ver. 077 .

Type locality.

“ Chonglom Mountain, Bhumiphol Dam reservoir, Samngao District, Tak province 17°14′51″N, 98°56′21″E ” (Thailand).

Differential diagnosis.

This species is not similar to any other congener due to the completely flat but high and broad last whorl which is also strongly descending near the aperture (almost 90 ° angle). The parietal side of the aperture is with only a single, parietal lamella while the angular is absent. Hypselostoma srakeoense, H. torticollis, and H. fungus sp. nov. are superficially similar but none of them are flat and the latter two are also spirally striated. Hypselostoma torticollis additionally has separated parietal and angular lamellae on the parietal side.

Distribution.

This species is known only from the type locality.