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

Fig. 62

Type material.

Holotype: Laos • 1 empty shell (H: 0.78 mm, D: 0.82 mm); Khammouane Province, 43.4 km from Nhommalath towards Nongchan (bridge on road #12), southern edge of Ban Khamhé, right side of road (locality code 2019/108); 17°34.74'N, 105°27.52'E; 210 m a.s.l.; 30 Sep. 2019; A. Hunyadi leg.; HNHM 105295.

Paratypes: Laos • 34 shells; same data as for holotype; coll. HA • 3 shells; same data as for holotype; coll. JJV.

Additional material.

Laos • 11 j/b shells; same data as for holotype; coll. HA.

Diagnosis.

A small Angustopila species with a conical to conical-globular shell, regularly developed parietal and palatal teeth that are situated inside the shell some distance from the peristome.

Description.

Shell small for the genus, slightly wider than high; off-white, translucent, conical to conical-globular; body whorl widest in standard apertural view; protoconch consists of 1.5 whorls with weak spiral striation preceding the first teleoconch whorl; teleoconch with very fine irregularly spaced, very weak radial growth lines crossed by much stronger, regularly spaced spiral striae (ca. 14-18 on body whorl from standard apertural view); on both ventral and dorsal surfaces of body whorl spiral lines far more dominant than radial lines; whorls 3.75-4, rounded or very slightly shouldered; aperture oblique to shell axis from lateral view; umbilicus wide, slightly excentric; aperture reniform, sinulus wide and weakly isolated due to the weak parietal and upper palatal teeth; peristome expanded, not reflected; parietal callus not protruding, not detached from penultimate whorl; parietal tooth rather low, short, situated inside some distance from parietal callus, perpendicular to parietal side; upper palatal tooth almost as high as parietal but wider, blunter, situated inside the shell some distance from peristome edge, at middle of palatal region, just opposite of parietal tooth.

Measurements (in mm).

H = 0.67-0.78; D = 0.72-0.82, H/D*100 = 91.8-97.2 (n = 4), RUD = 30.7-31.3 (n = 2).

Differential diagnosis.

Angustopila antidomedon sp. nov. has a higher spire, a more conical shell, and a lower situated parietal tooth. Angustopila occidentalis sp. nov. is much larger and has a lower situated parietal tooth. Angustopila pustulata sp. nov. has a concave-conical shell, it is also larger, has a weaker sculpture, and its palatal tooth is situated lower. See under A. tweediei sp. nov.

Etymology.

The specific epithet ( Angustopila bathyodon ) refers to the position of the apertural barriers (βαθύς = deep, ὀδούς = tooth in Greek). Namely, they are situated more posteriorly than those of the most similar species A. tweediei sp. nov.

Distribution.

Angustopila bathyodon sp. nov. is known from the type locality only in Khammouane Province of Laos (Fig. 55 ).

Figures

Figure 55. Distribution of Angustopila species.

Figure 62. Angustopila bathyodon Pall-Gergely & Hunyadi, sp. nov. A, C-I holotype (HNHM 105295) B paratype. Apertural (A, B), lateral (C), apical (D) and ventral (E) sculpture on the protoconch (F), sides of the shell; aperture (G); ventral (H) and frontal (I) surface of the body whorl.