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

Fig. 77

Type material.

Holotype: Vietnam • 1 empty shell (H: 0.84 mm, D: 0.93 mm); Hòa Bình Province, Hưng Thi, 37.8 km from Nho Quan towards Hanoi on the Hồ Chí Minh road, left side (locality code: 2020/46); 20°32.74'N, 105°41.89'E; 15 m a.s.l.; 16 Feb. 2020; A. Hunyadi leg.; HNHM 105312.

Paratypes: Vietnam • 1 imaged shell + 58 shells; same data as for holotype; coll. HA • 5 shells; same data as for holotype; coll. JJV.

Additional material.

Vietnam • 13j/b shells; same data as for holotype; coll. HA.

Diagnosis.

A medium-sized, conical or (more often) concave-conical Angustopila species with a relatively narrow umbilicus, weak sculpture, comparatively large aperture, a short parietal tooth and a wart-like lower palatal tooth.

Description.

Shell of normal size for the genus, slightly higher than wide or slightly wider than high; off-white, conical or more often concave-conical; body whorl widest from apertural view; protoconch consists of 1.25 whorls, with weak spiral striation on entire protoconch; teleoconch with fine, dense, irregularly spaced radial growth lines and somewhat stronger, equidistantly and sparsely-arranged spiral lines (ca. 16-19 on body whorl from standard apertural view); sculpture is weaker than in other Angustopila species; whorls 4 or slightly fewer, rounded or slightly shouldered; aperture slightly oblique to shell axis from lateral view; umbilicus relatively narrow; aperture subovoid or reniform with very wide, not distinctly separated sinulus; peristome expanded, not reflected; parietal callus not protruding, not detached from penultimate whorl; parietal tooth straight, strong, relatively low, situated in some distance from peristome edge; lower palatal tooth very small and blunt, blister-like, situated some distance inside the shell from peristome edge.

Measurements (in mm).

H = 0.84-1.00, D = 0.87-0.93 H/D*100 = 90.3-108.0 (n = 6), RUD = 21.8-26.9 (n = 2).

Differential diagnosis.

Angustopila parallela sp. nov. is larger, has a stronger palatal tooth, stronger spiral striation, and more depressed, more strongly concave shell shape. See also under A. antidomedon sp. nov., A. bathyodon sp. nov., A. gracilis sp. nov. and A. bathyodon sp. nov.

Etymology.

The specific epithet Angustopila pustulata (blister-bearing in Latin) refers to the low, blister-like palatal tooth.

Distribution.

Angustopila pustulata sp. nov. is known from the type locality only in Hòa Bình Province of northern Vietnam (Fig. 27 ).

Figures

Figure 27. Distribution of Angustopila species.

Figure 77. Angustopila pustulata Pall-Gergely & Hunyadi, sp. nov. A paratype B-I holotype (HNHM 105312). Apertural (A, B), lateral (C), apical (D) and ventral (E) sides of the shell; sculpture of the protoconch showing protoconch-teleoconch boundary (F); aperture (G); ventral (H) and frontal (I) surface of the body whorl.