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

Figs 95 , 96

Type material.

Holotype: Vietnam • 1 empty shell (H: 0.92 mm, D: 0.9 mm); Hòa Bình Province, Kim Bȏi District, Cao Dương, north of Đ ồng Phú, 58 km from Nho Quan towards Hanoi on the Hồ Chí Minh road (locality code: 2020/47); 20°42.59'N, 105°39.30'E; 10 m a.s.l.; 16 Feb. 2020; A. Hunyadi leg.; HNHM 105321.

Paratypes: Vietnam • 2 figured shells; same data as for holotype; HNHM 105322 • 87 shells; same data as for holotype; coll. HA • 3 shells; same data as for holotype; coll. JJV.

Additional material.

Vietnam • 21 j/b shells; same data as for holotype; coll. HA.

Diagnosis.

A medium-sized, concave-conical Angustopila species with a wide umbilicus, and three prominent apertural barriers (elevated parietal, pointed upper palatal, blunt, elongated columellar).

Description.

Shell small- to medium-sized for the genus, slightly higher than wide or slightly wider than high; off-white, concave-conical with regularly growing whorls except for the last one; body whorl widest from standard apertural view; protoconch consists of 1.5 whorls, with slight indication of spiral striation preceding the first teleoconch whorl; teleoconch with some fine, weak, irregular radial growth lines and much stronger, elevated, spiral striae of variable density (ca. 9-16 on body whorl in standard apertural view); whorls 4-4.5, rounded; aperture only slightly oblique to shell axis from lateral view; umbilicus wide; aperture suboval with straight parietal part; peristome expanded, not reflected; parietal callus not detached from penultimate whorl; parietal tooth elevated, mostly straight; palatal tooth situated in the middle of the palatal wall (probably homologous with the upper palatal tooth), small, denticle-like, situated close to basal lip; columellar tooth situated in the middle of columellar area, runs along peristome, lower and longer than palatal tooth.

Measurements (in mm).

H = 0.76-0.99; D = 0.82-0.95, H/D*100 = 91.6-112.5 (n = 9), RUD = 32.9-34.1 (n = 3).

Differential diagnosis.

See under A. apiaria sp. nov. and A. rara sp. nov. Some other species that normally have two apertural barriers may have a third one, see differential diagnosis under A. rara sp. nov.

Etymology.

This new species is named after its three apertural barriers.

Distribution.

This species is only known from the type locality of Cao Dương in Hòa Bình Province, Vietnam (Fig. 27 ).

Figures

Figure 27. Distribution of Angustopila species.

Figure 95. Angustopila tridentata Pall-Gergely & Hunyadi, sp. nov. (holotype, HNHM 105321). Apertural (A), apical (B), lateral (C) and ventral (D) sides of the shell; sculpture on the protoconch (E), ventral (F) and frontal (G) surface of the body whorl.

Figure 96. Variability of Angustopila tridentata Pall-Gergely & Hunyadi, sp. nov. A holotype (specimen 3) B specimen 2 C specimen 1.