Hypselostoma serpa Gojšina & Hunyadi & Sutcharit & Tongkerd & Auffenberg & Grego & Vermeulen & Reischütz & Páll-Gergely 2025, comb. nov.
Creators: name: Gojšina, Vukašin
name: Hunyadi, András
name: Sutcharit, Chirasak
name: Tongkerd, Piyoros
name: Auffenberg, Kurt
name: Grego, Jozef
name: Vermeulen, Jaap J.
name: Reischütz, Alexander
name: Páll-Gergely, Barna
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Stylommatophora
Hypselostomatidae
Hypselostoma
Hypselostoma serpa

description: Hypselostoma serpa (van Benthem Jutting, 1950) comb. nov.
Figs 224 H, 234, 241
Paraboysidia serpa van Benthem Jutting, 1950: 18–19, 40, fig. 8.
Paraboysidia serpa — Maassen 2001: 75.
Paraboysidia tarutao Panha & Burch, 2002 c: 85–87, fig. 4. syn. nov.
Gyliotrachela tarutoa [sic] — Panha and Burch 2008: 84, fig. 73.
Gyliotrachela tarutao — Dumrongrojwattana and Wongkamhaeng 2024: 324, fig. 8.
Type material examined.
Malaysia • 18 paratypes of H. serpa; from the type locality; Dec. 1938; Raffles Museum, Singapore ex. coll.; RMNH.Moll.140164. Thailand • 1 paratype of G. tarutao; from the type locality; 1998; S. Panha leg.; CUMZ ver. 062.
Additional material examined.
Thailand • 22 shells; Krabi Province, Railay (= Rai Leh) Beach West, Railay Highlands, at the base of limestone rocks; 8°0.865'N, 98°50.219'E; 30 m a. s. l.; Sep. 2007; A. Reischütz leg.; coll. REI • 1 shell; Krabi Province, Phi Phi islands, Phi Phi Don island, climbing rock above the western end of the beach in Ton Sai Bay, at the base of limestone rocks in the forest; 7°44.063'N, 98°45.947'E; 50 m a. s. l.; Mar. 2010; A. Reischütz leg; coll. REI.
Type localities.
“ Baling, Kedah ”, Malaysia (H. serpa); “ Tarutoa National Park, Satul Province, Thailand, 6 ° 41 ' 58 ' N, 99 ° 38 ' 48 ' E, 70 meters elevation ” (P. tarutao).
Differential diagnosis.
Hypselostoma serpa is most similar to H. frequens, from which it can be separated by the keeled last whorl (rounded in H. frequens), the bent upper palatal plica and the wider umbilicus. Hypselostoma kelantanense has a more ovoid shell shape, more rounded and bulging whorls as well as narrower umbilicus.
Distribution.
This species is known from Kedah, Malaysia (the type locality) as well as from Krabi Province and Ko Tarutao Island, Satun province, Thailand (the type locality of G. tarutao).
Remarks.
In the paratypes, interpalatal plica is simple or bulge like, infraparietal lamella can be present or absent. All examined paratypes have upper palatal plica curved towards the lower one which could be characteristic for this species. Paraboysidia tarutao is treated as a junior synonym of this species since no morphological differences were noticed. In the original description (Panha and Burch 2002 c), P. tarutao was not compared to H. serpa which gives the impression that the latter was overlooked.
description: Published as part of Gojšina, Vukašin, Hunyadi, András, Sutcharit, Chirasak, Tongkerd, Piyoros, Auffenberg, Kurt, Grego, Jozef, Vermeulen, Jaap J., Reischütz, Alexander & Páll-Gergely, Barna, 2025, A new start? Revision of the genera Anauchen, Bensonella, Gyliotrachela and Hypselostoma (Gastropoda, Eupulmonata, Hypselostomatidae) of Southeast Asia with description of 46 new species, pp. 1-338 in ZooKeys 1235 on pages 1-338, DOI: 10.3897/zookeys.1235.145281