Angustopila vitrina Pall-Gergely & Hunyadi, 2023

Pall-Gergely, Barna, Hunyadi, Andras, Vermeulen, Jaap J., Grego, Jozef, Sutcharit, Chirasak, Reischuetz, Alexander, Dumrongrojwattana, Pongrat, Botta-Dukat, Zoltan, Oerstan, Aydin, Fekete, Judit & Jochum, Adrienne, 2023, Five times over: 42 new Angustopila species highlight Southeast Asia's rich biodiversity (Gastropoda, Stylommatophora, Hypselostomatidae), ZooKeys 1147, pp. 1-177 : 1

Angustopila vitrina Pall-Gergely & Hunyadi sp. nov.

Fig. 85

Type material.

Holotype: Vietnam • 1 empty shell (H: 0.83 mm, D: 0.78 mm); Thanh Hóa Province, Như Thanh District, 600 m south from Xuân Khang along road no. 45, around the cave temple (locality code: 2020/40); 19°40.35'N, 105°31.07'E; 80 m a.s.l.; 14 Feb. 2020; A. Hunyadi leg.; HNHM 105315.

Paratypes: Vietnam • 7 shells; same data as for holotype; coll. HA.

Diagnosis.

A small to medium-sized, conical Angustopila species with a strong, elevated, clavate parietal tooth, and a small, blunt, blister-like subcolumellar tooth.

Description.

Shell small to medium-sized for the genus, slightly higher than wide; pale grey, translucent, conical or slightly concave-conical with an elevated spire; body whorl widest from standard apertural view; protoconch consists of ca. 1.5 whorls, with weak signs of spiral structure preceding the first teleoconch whorl; teleoconch with some fine, irregular radial growth lines and similarly fine, irregularly-arranged spiral striae (ca. 14 or 15 on body whorl from standard apertural view); whorls 4.5-4.75, slightly shouldered; aperture only very slightly oblique to shell axis from lateral view; umbilicus moderately wide; aperture ovate, sinulus broad; peristome expanded, not reflected; parietal callus not protruding, slightly detached from penultimate whorl; parietal tooth prominent, high, extends beyond half of aperture width, with club-like cross section, perpendicular to parietal side, almost reaching edge of peristome; subcolumellar tooth blister-like (see also remarks), rarely absent, situated in some distance from peristome.

Measurements (in mm).

H = 0.82-0.87, D = 0.74-0.85, H/D*100 = 100-112.2 (n = 5), RUD = 26.9-28.6 (n = 2).

Differential diagnosis.

Angustopila margaritarion sp. nov. is the most similar species due to the strong, club-shaped parietal tooth. It has 1 less whorl and a conical-ovoid shape and lacks the subcolumellar tooth.

Etymology.

The specific epithet refers to the glass-like transparent shell of this new species.

Distribution.

Angustopila vitrina sp. nov. is known from the type locality only in Thanh Hóa Province, Vietnam (Fig. 27 ).

Remarks.

One out of the seven paratypes also lacks the subcolumellar tooth. The species is still recognisable and can be distinguished from other Angustopila by possessing a single parietal tooth as well by its distinct morphology (having a club-like cross section).

Figures

Figure 27. Distribution of Angustopila species.

Figure 85. Angustopila vitrina Pall-Gergely & Hunyadi, sp. nov. (holotype, HNHM 105315). Apertural (A), lateral (B), apical (C), ventral (D) sides of the shell; aperture (E); sculpture of the protoconch (F), ventral (G) and frontal (H) surface of the body whorl.