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

Hypselostoma sichang (Panha & J. B. Burch, 2002) comb. nov. Figs 186 L, 209, 210, 223 Anauchen sichang Panha & Burch, 2002 e: 21, fig. 2. Gyliotrachela sichang — Panha and Burch 2008: 80, fig. 69; Dumrongrojwattana and Wongkamhaeng 2024: 324, fig. 8. Type material examined. Thailand • holotype; 2001; S. Panha leg.; CUMZ 44001 • 2 paratypes; from the type locality; 2001; S. Panha leg.; SMF 331463. Additional material examined. Thailand • 10 shells; Sa Kaeo Province, Wang Sombun district, vicinity of Tham Khoa Phlapphueng Thong; 13°26.873'N, 102°13.071'E; 06 Mar. 2023; A. Hunyadi leg.; coll. HA. Type locality. “ Sichang island, Si Racha, Chon Buri Province, 13°20′05″N, 100°55′24″E, 70 meters elevation ” (Thailand). Differential diagnosis. This species is similar to H. hungerfordianum from which it can be separated by the much stronger and lower peripheral keel, very rough, sandpaper-like shell surface sculpture as well as the narrower umbilicus. See also under H. vesovici sp. nov. Distribution. This species is, apart from the type locality, known from one more sampling site in Sa Kaeo Province.