Anauchen obesus Gojšina, Hunyadi & Páll-Gergely, 2025

Anauchen obesus Gojšina, Hunyadi & Páll-Gergely sp. nov.

Figs 10 M View Figure 10 , 26 View Figure 26 , 27 View Figure 27 , 37 View Figure 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 View Materials GoogleMaps . Paratypes. Thailand • 15 shells; same data as for holotype; coll. HA GoogleMaps • 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 GoogleMaps .

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 GoogleMaps .

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.