Anauchen obesus Gojsina, Hunyadi & Pall-Gergely 2025, sp. 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
Anauchen
Anauchen obesus

description: Anauchen obesus Gojšina, Hunyadi & Páll-Gergely sp. nov.
Figs 10 M, 26, 27, 37
Type material.
Holotype. Thailand • 1 shell (SH: 2.94 mm, SW: 2.26 mm); Chiang Rai Province, Doi Tung, 50 metres before Wat Phra That Doi Tung, vicinity of the parking lot; 20°19.540'N, 99°49.987'E; 1350 m; 12 Feb. 2015; A. Hunyadi leg.; CUMZ 14429. Paratypes. Thailand • 15 shells; same data as for holotype; coll. HA • 10 shells; Chiang Rai Province, Doi Tung; 20°20′32″N, 99°50′21″E; 1320 m a. s. l.; 08. May 1988; F. G. Thompson leg.; locality code FGT-4417; UF 591335.
Additional material examined.
Thailand • 1 shell (juvenile, not paratype); Chiang Rai Province, Doi Tung; 20°20′32″N, 99°50′21″E; 1320 m a. s. l.; 08. May 1988; F. G. Thompson leg.; locality code FGT-4417; UF 583720.
Type locality.
Thailand, Chiang Rai Province, Doi Tung, 50 metres before Wat Phra That Doi Tung, vicinity of the parking lot; 20°19.540'N, 99°49.987'E; 1350 m.
Diagnosis.
Anauchen species with conical-ovoid, brown shell, pasty-like surface, last whorl adnate to the penultimate, five apertural barriers (parietal (angulo-parietal), upper palatal, lower palatal, weak basal, and columellar) and a narrow umbilicus.
Description.
Shell conical-ovoid, brown, with 4.5–5 whorls separated by a deep suture. All whorls convex, bulging, rounded. Protoconch consists of ~ 1.5 whorls, finely pitted and with moderate spiral striae, the same colour as the rest of the shell. Teleoconch fine, pasty, with inconspicuous, irregular growth radial lines which are rarely more pronounced and in form of whitish streaks, most dense right behind the peristome. Spiral striation absent. Last whorl adnate to the penultimate and slightly descending (~ 25 ° compared to the shell axis) making the aperture profile prosocline to the shell axis. Peristome continuous, in form of a short and not much expanded callus leaning on the penultimate whorl at the parietal side. It is white, expanded but not reflected. Aperture equipped with five barriers (parietal (angulo-parietal), upper palatal, lower palatal, basal and columellar). Parietal (angulo-parietal) lamella almost fully reaching the expanded peristome edge. It is the largest in the aperture, sometimes single and sometimes with an additional smaller part, which is probably homologous with the angular lamella in other genera, pointed towards the palatal side. Upper palatal plica is weaker, lower, and less slender than the lower palatal. Lower palatal plica almost as strong as the angulo-parietal lamella. Basal plica in the form of inconspicuous knob, like a very slight swelling in the basal-columellar transition area. Columellar lamella almost reaching the expanded peristome, highest in its middle part and sloping towards the peristome edge where it becomes quite low. It is leaned towards the lower palatal plica. Surface of all apertural barriers is very finely granulated. Sinulus rounded, parabolic and well separated from the rest of the aperture. Umbilicus narrow, ~ 1 / 8 of the shell width, previous whorls not clearly visible through it. Umbilical groove absent.
Differential diagnosis.
Anauchen obesus sp. nov. is similar in shell shape to A. angthongensis, A. crassus sp. nov., A. eotvosi and A. informis. However, A. obesus sp. nov. can be separated by its smaller size and more globular shell.
Measurements
(in mm, n = 4). SH = 2.71–3; SW = 1.95–2.26; AH = 1.1–1.27; AW = 1.06–1.23.
Etymology.
This species is named for its globose shell.
Distribution.
This species is known only from Doi Tung mountain.
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