Angustopila, Jochum, Slapnik & Pall-Gergely, 2014

Dumrongrojwattana, Pongrat, , Sirilan Chuenit, Wongkamhaeng, & Koraon, 2021, A new species of the world’s smallest cave snail of the genus Angustopila Jochum, Slapnik & Páll-Gergely in Jochum, et al., 2014 (Gastropoda: Hypselostomatidae) from eastern Thailand, Raffles Bulletin of Zoology 69, pp. 102-108 : 106

Key to species of Angustopila

1. Shell without apertural teeth................................................... 2

– Shell with apertural teeth........................................................ 3

2. Protoconch sculpture reticulated granules............... A. elevata

– Protoconch finely pitted and granular with a powdery superficial texture.................................................................. A. subelevata

3. Apertural teeth consist of only parietal tooth......................... 4

– Apertural teeth consist of 2 or 3 teeth ...................................6

4. Aperture heart-shaped; persistome slightly expanded; not reflected ..................................................................... A. fabella

– Aperture circular or rounded; peristome slightly expanded .... ................................................................................................. 5

5. Teleoconch sculpture irregular growth lines crossed with fine spiral threads; peristome slightly thickened ... A. singuladentis

– Teleoconch sculpture finely reticulate, spiral threads; peristome not thickened .......................................................... A. szekeresi

6. Apertural teeth consist of weak parietal indentation; low ridgelike angular lamella and upper palatal ................... A. concava

– Apertural teeth consist of parietal tooth and palatal tooth ....7

7. Teleoconch sculpture very fine irregular axial lamellae, reticulating micro granules...................................... A. huoyani

– Teleconch sculpture with spiral fine reticulate spiral threads.. ................................................................................................. 8

8. Shell lenticular; teleoconch sculpture irregular growth lines crossed with fine spiral threads; umbilicus deep and relatively narrow.......................................... A. pallgergelyi , new species

– Shell conical or globular with teleoconch sculpture not as above........................................................................................ 9

9. Shell conical; aperture semicircular; teleoconch sculpture with spiral threads.............................................................. A. tamlod

– Shell globular; aperture elliptical; teleoconch sculpture finely reticulate, spiral threads ...................................... A. dominikae