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

Fig. 60

Type material.

Holotype: Vietnam • 1 empty shell (H: 0.88 mm, D: 0.87 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 105293.

Paratypes: Vietnam • 16 shells; same data as for holotype; coll. HA.

Diagnosis.

A medium-sized, concave-conical Angustopila species with a wide umbilicus, dense spiral striation, a prominent palatal and a highly situated upper parietal tooth.

Description.

Shell of normal size for the genus, higher than wide, or rarely slightly wider than high; off-white, concave-conical; body whorl widest from standard apertural view; protoconch consists of 1.25 whorls, with very slight indication of spiral striation preceding the first teleoconch whorl; teleoconch with fine, dense, irregularly spaced radial growth lines and much stronger, equidistantly-arranged dense spiral lines (ca. 16-20 on body whorl from standard apertural view); whorls 4.5, slightly shouldered; aperture oblique to shell axis from lateral view; umbilicus moderately wide; aperture pear-shaped with a parabolic sinulus caused by alignment of the parietal and upper palatal tooth; peristome expanded, not reflected; parietal callus protruding, detached from penultimate whorl; parietal tooth straight, strong but short, almost reaching peristome edge; upper palatal tooth situated very high in the aperture, points in direction of parietal tooth, blunter and wider than parietal tooth.

Measurements (in mm).

H = 0.88-1.04, D = 0.86-0.91, H/D*100 = 98.9-118.2 (n = 5), RUD = 26.4-27.3 (n = 2).

Differential diagnosis.

Angustopila akrodon sp. nov. differs from the much larger A. majuscula sp. nov. in the concave-conical shell shape, the blunter apex, denser spiral striation and the narrower sinulus. Angustopila concava is larger, it has a more oblique aperture and a weaker parietal tooth and lacks a palatal tooth.

Etymology.

The upper parietal tooth is situated very high compared to other species with two apertural teeth (ἄκρον = highest, ὀδούς = tooth in Greek).

Distribution.

Angustopila akrodon sp. nov. is known from the type locality only in Thanh Hóa Province of northern Vietnam (Fig. 31 ).

Figures

Figure 31. Distribution of Angustopila species.

Figure 60. Angustopila akrodon Pall-Gergely & Hunyadi, sp. nov. A, C-H holotype (HNHM 105293) B paratype. Apertural (A, B), lateral (C), apical (D) and ventral (E) sides of the shell; sculpture on the protoconch (F), ventral (G) and frontal (H) surface of the body whorl.