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

Fig. 53

Type material.

Holotype: Vietnam • 1 empty shell (H: 0.67 mm, D: 0.73 mm); Lạng Sơn Province, Hữu Lũng District, Minh Tiến, 1400 m northeast Cầu Cheo Minh Tiến (locality code: 2020/55); 21°34.02'N, 106°17.79'E; 30 m a.s.l.; 20 Feb. 2020; A. Hunyadi leg.; HNHM 105290.

Paratypes: Vietnam • 12 shells; same data as for holotype; coll. HA.

Additional material.

Vietnam • 1 j/b shell; same data as for holotype; coll. HA.

Diagnosis.

A small, domed Angustopila species with a very high and long parietal tooth.

Description.

Shell small for the genus, slightly wider than high or as wide as high; transparent, pale grey, dorsal side domed; body whorl widest from standard apertural view; protoconch consists of almost 1.75 whorls, with strong spiral striation; teleoconch ornamented by weak, irregular radial growth lines and irregularly spaced, much stronger spiral striae (ca. 10 or 11 on body whorl from standard apertural view); whorls 3.75, rounded or depressed-rounded; aperture slightly oblique to shell axis from lateral view; umbilicus very wide; parietal callus detached from penultimate whorl; aperture pear-shaped; peristome expanded but not reflected; parietal tooth starts from parietal callus, strongly elongated inside aperture, conspicuously elevated (extends beyond 1/2 aperture), slightly curves in direction of palatal wall.

Measurements (in mm).

H = 0.67-0.77, D = 0.73-0.78, H/D*100 = 91.8-100 (n = 5), RUD = 33.8-36.4 (n = 2).

Differential diagnosis.

The nearby occurring, A. vomer sp. nov., is similar in possessing a highly elevated, long parietal tooth. However, it has a larger, concave-conical (rather than domed) shell, a narrower umbilicus, a more rounded aperture (wider sinulus), and its parietal tooth does not turn towards the palatal wall, and does not reach the parietal callus. The most similar species in terms of shell and aperture shape is A. quadridens sp. nov., which possesses four teeth.

Etymology.

The specific epithet (prolixo = elongated in Latin) refers to the unusually long parietal tooth of this new species.

Distribution.

This new species is known only from its type locality (Fig. 27 ).

Figures

Figure 27. Distribution of Angustopila species.

Figure 53. Angustopila prolixa Pall-Gergely & Hunyadi, sp. nov. Holotype (HNHM 105290): A, C-G, I-J), paratypes (2020 / 55, specimen 1: B 2020 / 55, specimen 3: H). Apertural (A, B), lateral (C), apical (D) and ventral (E) sides of the shell; aperture (F), sculpture on the protoconch (G), parietal tooth (H); ventral (I) and frontal (J) surface of the body whorl.