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

Fig. 73

Type material.

Holotype: Vietnam • 1 empty shell (H: 0.66 mm, D: 0.66 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 105297.

Paratypes: Vietnam • 1 figured shell + 39 shells + 3 live-collected specimens covered in mud; same data as for holotype; coll. HA.

Diagnosis.

A small Angustopila species with a conical to conical-globular shell, a shouldered body whorl, a strong parietal tooth reaching the peristome edge, and an upper palatal tooth of ca. 1/2 size.

Description.

Shell small for the genus, shell slightly higher than wide or rarely as high as wide; off-white, translucent when fresh, conical to conical-globular; body whorl widest in apertural view; protoconch consists of 1-1.25 whorls with spiral striation preceding the first teleoconch whorl; teleoconch with very weak, regularly spaced radial ribs crossed by stronger spiral striae (ca. 12-15 on body whorl from apertural view); whorls ca. 3.5, slightly shouldered, “pushed” from baso-lateral direction from apertural view; aperture very slightly oblique to shell axis from lateral view; umbilicus moderately wide; aperture pear-shaped, sinulus narrow and strongly isolated due to the near joining of the strong parietal and upper palatal teeth; peristome expanded, not reflected; parietal callus slightly protruding, slightly detached from penultimate whorl (aperture not adnate); parietal tooth elevated, strong, short, reaches parietal callus, slightly curved in direction of palatal tooth; upper palatal tooth ca. 1/2 as high as parietal tooth, situated near peristome edge, just opposite of parietal tooth.

Measurements (in mm).

H = 0.66-0.75, D = 0.64-0.75, H/D*100 = 100-112.5 (n = 7), RUD = 26.6-29.2 (n = 3).

Differential diagnosis.

Similar only to A. coprologos and A. psammion in size. This new species can be distinguished from all congeners based on the combination of the very small, conical to conical-globular shell and the two apertural denticles.

Etymology.

The tiny shells of this species with approximately equal shell height and width resemble poppy ( Papaver ) seeds. The specific epithet is to be used as a noun in apposition.

Distribution.

Angustopila papaver sp. nov. is known from the type locality only in Thanh Hóa Province of northern Vietnam (Fig. 48 ).

Figures

Figure 48. Distribution of Angustopila species.

Figure 73. Angustopila papaver Pall-Gergely & Hunyadi, sp. nov. A, C-I holotype (HNHM 105297) B paratype. Apertural (A, B), lateral (C), apical (D) and ventral (E) sides of the shell; sculpture on the protoconch (F); aperture (G); ventral (H) and frontal (I) surface of the body whorl.