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

Fig. 61

Type material.

Holotype: Vietnam • 1 empty shell (H: 0.94 mm, D: 0.83 mm); Thanh Hóa Province, Như Thanh District, Hải Vân, Hang Lò Cao Kháng Chiến, vicinity of the cave (locality code: 2020/41); 19°37.08'N, 105°34.63'E; 20 m a.s.l.; 14 Feb. 2020; A. Hunyadi leg.; HNHM 105294.

Paratypes: Vietnam • 1 imaged + 8 other shells; same data as for holotype; coll. HA.

Diagnosis.

A medium-sized, conical Angustopila species with a narrow umbilicus, a parietal tooth and a blunt but strong palatal tooth situated at the lower part of the palatal side.

Description.

Shell of normal size for the genus, higher than wide; off-white, conical; body whorl widest from standard apertural view; protoconch consists of 1.25 whorls, with weak spiral striation preceding the first teleoconch whorl; teleoconch with rather strong, irregularly spaced radial growth lines and equally strong, equidistantly and sparsely-arranged spiral striae (ca. 12-19 on body whorl from standard apertural view); whorls 4.5 or slightly less, rounded or very slightly depressed-rounded in form; aperture oblique to shell axis from lateral view; umbilicus narrow; aperture subovoid or reniform with very wide, not distinctly separated sinulus; peristome expanded, not reflected; parietal callus slightly protruding, somewhat detached from penultimate whorl; parietal tooth straight, strong, normally high and long, situated inside shell at some distance from peristome edge; lower palatal tooth, blunt but strong; approximately half of the available shells has a tiny subcolumellar tooth.

Measurements (in mm).

H = 0.86-0.94; D = 0.82-0.88, H/D*100 = 103.6-113.3 (n = 4), RUD = 24.2-25.0 (n = 2).

Differential diagnosis.

Angustopila pustulata sp. nov. is generally larger (wider), although the size ranges slightly overlap (D of A. antidomedon sp. nov.: 0.82-0.88 mm, D of A. pustulata sp. nov.: 0.87-0.93 mm), it has a lower spire (Fig. 77A is a rare example, nearly all shells have a low spire, similar to the holotype), and its palatal tooth is much lower (weaker). Moreover, some shells of A. antidomedon sp. nov. possess a small columellar tooth. Angustopila occidentalis sp. nov. is larger, has a lower spire and a comparatively larger aperture with usually weaker palatal tooth. Angustopila uvula sp. nov. has a concave-conical shell and a stronger parietal lamella. See also under A. bathyodon sp. nov. and A. gracilis sp. nov.

Etymology.

From the Greek ἀντιδομή (= opposed) and ὀδούς (= tooth) referring to the position of the palatal tooth in relation to the parietal tooth.

Distribution.

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

Figures

Figure 27. Distribution of Angustopila species.

Figure 61. Angustopila antidomedon Pall-Gergely & Hunyadi, sp. nov. A, C-F, I, J holotype (HNHM 105293) B, H paratype (specimen 2). Apertural (A, B), lateral (C), apical (D) and ventral (E) sides of the shell; sculpture on the protoconch (F), aperture (G, H); ventral (I) and frontal (J) surface of the body whorl.

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.