A new start? Revision of the genera Anauchen, Bensonella, Gyliotrachela and Hypselostoma (Gastropoda, Eupulmonata, Hypselostomatidae) of Southeast Asia with description of 46 new species Gojšina, Vukašin Hunyadi, András Sutcharit, Chirasak Tongkerd, Piyoros Auffenberg, Kurt Grego, Jozef Vermeulen, Jaap J. Reischütz, Alexander Páll-Gergely, Barna ZooKeys 2025 2025-04-23 1235 1 338 Gojsina, Hunyadi & Pall-Gergely Gojsina, Hunyadi & Pall-Gergely 2025 Gastropoda Hypselostomatidae Anauchen CoL,GBIF Animalia Stylommatophora Mollusca species obesus 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. Hunyadileg.;  CUMZ14429.    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 ma. s. l.;  08. May 1988; F. G. Thompsonleg.; locality code FGT-4417;  UF591335.   Additional material examined.    Thailand• 1 shell(juvenile, not paratype); Chiang Rai Province, Doi Tung;  20°20′32″N, 99°50′21″E;  1320 ma. s. l.;  08. May 1988; F. G. Thompsonleg.; locality code FGT-4417;  UF583720.   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.   Anauchenspecies 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.   Figure 26.   Anauchen obesusGojšina, Hunyadi & Páll-Gergely, sp. nov., holotype ( CUMZ14429) A – Dshell E, Fenlarged apertural views.   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.   Figure 27. SEM imaging of  Anauchen obesusGojšina, Hunyadi & Páll-Gergely, sp. nov., holotype ( CUMZ14429) Aprotoconch surface Bteleoconch surface Cenlarged apertural view.   Differential diagnosis.   Anauchen obesus sp. nov.is similar in shell shape to  A. angthongensis,  A. crassus sp. nov.,  A. eotvosiand  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. 5132464396 2015-02-12 CUMZ A. Hunyadi Thailand 1350 20.325666 Wat Phra That Doi Tung 1 99.833115 Doi Tung CUMZ 14429 1 Chiang Rai holotype 5132464383 2015-02-12 HA A. Hunyadi Thailand 1350 20.325666 Wat Phra That Doi Tung 1 99.833115 Doi Tung 1 Chiang Rai paratype 5132464889 1988-05-08 UF F. G. Thompson Thailand 1320 20.342222 Doi Tung 21 99.83917 UF 591335 1 Chiang Rai paratype 5132464524 1988-05-08 UF F. G. Thompson Thailand 1320 20.342222 Doi Tung 21 99.83917 UF 583720 1 Chiang Rai paratype