Angustopila vomer 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 vomer Pall-Gergely & Hunyadi sp. nov.

Fig. 59

Type material.

Holotype: Vietnam • 1 empty shell (H: 0.85 mm, D: 0.83 mm); Lạng Sơn Province, Hữu Lũng District, Hữu Liên, 1400 m west from Đȏng Lâm along road no. 241 (locality code: 2020/53); 21°41.91'N, 106°21.77'E; 210 m a.s.l.; 19 Feb. 2020; A. Hunyadi leg.; HNHM 105292.

Paratypes: Vietnam • 2 shells; same data as for holotype; coll. HA.

Diagnosis.

A small to medium-sized, concave-conical Angustopila species with a very high and long parietal tooth.

Description.

Shell small to medium-sized for the genus, slightly higher than wide or slightly wider than high; transparent, pale grey, concave-conical; body whorl widest from standard apertural view; protoconch consists of 1.5 whorls, with very slight spiral striation preceding the first teleoconch whorl; teleoconch ornamented by rather strong, irregularly spaced radial growth lines and equidistantly-spaced spiral striae of comparable strength or even stronger than the radial lines (ca. 10-11 on body whorl from standard apertural view); whorls 3.75, rounded or depressed-rounded; aperture strongly oblique to shell axis from lateral view; moderately wide; parietal callus attached (smeared) onto penultimate whorl; aperture subcircular-quadrate with strongly expanded peristome; parietal tooth starts in some distance from parietal callus, strongly elongated inside aperture, conspicuously elevated (extends beyond half aperture), straight or slightly curves in direction of palatal wall.

Differential diagnosis.

Some populations of Angustopila fabella are similar in overall shell shape, but all of those have a lower (less elevated) parietal tooth. See also under A. prolixa sp. nov.

Measurements (in mm).

H = 0.8-0.85, D = 0.82-0.88, H/D*100 = 90.9-103.7 (n = 3), RUD = 27.1-27.3 (n = 2).

Etymology.

This species is named after its elevated (high) parietal tooth resembling the Angustopila vomer bone, forming part of the nasal septum of the human skull (to be used as noun in apposition).

Distribution.

This new species is known only from its type locality (Fig. 48 ).

Figures

Figure 48. Distribution of Angustopila species.

Figure 59. Angustopila vomer Pall-Gergely & Hunyadi, sp. nov. (holotype, HNHM 105292). Apertural (A), lateral (B), apical (C) and ventral (D) sides of the shell; aperture (E, F); sculpture on the protoconch (G), ventral (H) and frontal (I) surface of the body whorl.