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

Fig. 84

Type material.

Holotype: Thailand • 1 empty shell (H: 1.0 mm, D: 0.95 mm); Chumphon Province, Pathio NE 2.5 km, Tham Khao Phlu (locality code: 2015/37); 10°43.85'N, 99°19.24'E; 30 m a.s.l.; 23 Feb. 2015; A. Hunyadi leg.; CUMZ 7439.

Paratypes: Thailand • 2 shells; same data as for holotype; NMBE 550647 • 2 shells; same data as for holotype; coll. PGB • 62 shells; same data as for holotype; coll. HA • 3 shells; same data as for holotype; coll. JJV.

Additional material.

Thailand • 16 j/b shells; same data as for holotype; coll. HA.

Diagnosis.

A medium-sized Angustopila species with concave-conical shell, widened body whorl, wide umbilicus, and strong parietal and lower palatal teeth.

Description.

Shell of normal size for the genus, slightly higher than wide or slightly wider than high; pale grey, concave-conical with broadly widened body whorl; protoconch consists of 1.25 whorls, with very weak signs of spiral striation on its last whorl; teleoconch finely ornamented with irregularly spaced, strong radial growth lines crossed by fine rows of regularly spaced spiral striae (ca. 16-18 on body whorl from apertural view); on ventral surface of body whorl radial lines dominant (in ca. half of specimens radial lines not conspicuous); frontal surface of body whorl with equally strong radial and spiral lines, or spiral ones stronger; whorls 4.5, rounded; aperture oblique to shell axis from lateral view; umbilicus wide; aperture ovoid, divided into two sections by long parietal tooth; sinulus wide, even larger in area than other portion of aperture; peristome expanded, not reflected; parietal callus not conspicuous, detached from penultimate whorl; parietal tooth very high along the parietal side, perpendicular to shell wall; palatal tooth minute, blunt, situated opposite and slightly to the left of the parietal tooth, and inside the aperture a small distance from peristome.

Measurements (in mm).

H = 0.86-0.98, D = 0.93-0.99, H/D*100 = 86.9-106.5 (n = 13), RUD = 30.9-32.0 (n = 3).

Differential diagnosis.

Angustopila uvula sp. nov. is most similar to Angustopila occidentalis sp. nov., but differs from that species in the following characters: shell concave-conical (instead of conical), body whorl wider, radial lines often stronger on the body whorl, parietal tooth higher and ends closer to peristome. Angustopila concava is larger than A. uvula sp. nov., its aperture is more oblique, lacks a palatal tooth, and has a weaker parietal tooth. The shell shape of A. uvula sp. nov. is also similar to that of other Angustopila species possessing a single apertural tooth ( A. fabella , A. monodon sp. nov.). See also under A. antidomedon sp. nov.

Etymology.

The parietal tooth of this new species is reminiscent of the fleshy Angustopila uvula structure at the back of the human throat. The specific epithet Angustopila uvula is to be used as a noun in apposition.

Distribution.

This species is known only from the type locality in Thailand’s Chumphon Province (Fig. 19 ).

Figures

Figure 19. Distribution of Angustopila species.

Figure 84. Angustopila uvula Pall-Gergely & Hunyadi, sp. nov. (holotype, CUMZ 7439). Apertural (A), ventral (B), apical (C) and lateral (D) sides of the shell; sculpture on the protoconch (E); aperture (F); ventral (G) and frontal (H) surface of the body whorl.