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

Hypselostoma khaochakan (Panha & J. B. Burch, 2003) comb. nov. Gyliotrachela khaochakan Panha & Burch in Burch et al. 2003: 138–143, figs 4–5. Gyliotrachela srirachaensis Panha & Burch in Panha et al. 2004: 69–70, fig. 8. syn. nov. Gyliotrachela khaochakan — Tongkerd et al. 2004: 143, fig. 2; Panha and Burch 2008: 69–70, fig. 60; Dumrongrojwattana and Wongkamhaeng 2024: 323, fig. 8. Gyliotrachela srirachaensis — Panha and Burch 2008: 81, fig. 70; Dumrongrojwattana and Wongkamhaeng 2024: 324, fig. 8. Type material examined. Thailand • 2 paratypes of H. khaochakan; from the type locality; SMF 331445 • 1 paratype of H. khaochakan; from the type locality; CUMZ 44041 • 1 paratype of G. srirachaensis; from the type locality; S. Panha leg.; CUMZ ver. 44008. Additional material examined. 4 shells; Sa Kaeo Province, Khao Chakan district, vicinity of Wat Tham Khao Chakan; 13°39.668'N 102°05.195'E; 80 m a. s. l.; 05 Mar. 2023, A. Hunyadi & J. U. Otani leg.; coll. HA. Type localities. “ Chakan Mountain, east of Khaochakan Temple, Khaochakan District, Srakeaw Province, 13°39'17"N, 102°5'12"E, 70 meters elevation, Thailand ” (H. khaochakan); “ Sichang Island, Sriracha, Chonburi Province, 13°20'05"N, 100°55'24"E, 70 meters elevation ” (H. srirachaensis). Differential diagnosis. This species differs from H. chedi by the separated angular and parietal lamellae. See also under H. smokon. Distribution. This species is, apart from the type locality, known also from Sichang Island (type locality of H. srirachaensis). Remarks. Gyliotrachela srirachaensis is a junior synonym of H. khaochakan since we could not find any morphological differences. The two species were not compared in the original description of G. srirachaensis.