Angustopila occidentalis Pall-Gergely & Hunyadi, 2023

Tongkerd, Piyoros, Lwin, Ngwe, Pall-Gergely, Barna, Chanabun, Ratmanee, Pholyotha, Arthit, Prasankok, Pongpun, Seesamut, Teerapong, Siriwut, Warut, Srisonchai, Ruttapon, Sutcharit, Chirasak & Panha, Somsak, 2024, Contributions of a small collection of terrestrial microsnails (Pupilloidea, Hypselostomatidae) from Myanmar with description of three new species, ZooKeys 1195, pp. 157-197 : 157

Angustopila occidentalis Pall-Gergely & Hunyadi, 2023

Figs 3 , 13D

Angustopila occidentalis Páll-Gergely & Hunyadi in Páll-Gergely et al. 2023: 118-122, figs 70-72. Type locality: Shan State, ca 6 km east from Hsihseng centre.

Material examined.

Parpant area , Taunggyi City, Shan State, Myanmar (locality code: Sh8) 20°15'3.7"N, 97°14'23.9"E; 1159 m a.s.l.: CUMZ 14389 (1 shell; Fig. 3A, B ), CUMZ 14390 (7 shells; Fig. 3C, D ) .

Distribution.

This species is known from several localities in Shan State, Myanmar ( Páll-Gergely et al. 2023).

Remarks.

Angustopila occidentalis is uniquely recognised by a minute conical shell and whorls that are slightly shouldered and rounded on the periphery. The protoconch is uniquely radially striated (Fig. 3A, B ), while all congeners known so far lack radial striation at this early developmental stage. Apertural dentition with one large parietal lamella.

In Myanmar, this species is widely distributed. The individuals examined herein were also collected from the limestone wall inside Parpant Cave, Shan State. These specimens agree well with the type specimen of this species (Fig. 13D ) in having a medium-sized, low conical shell, one strong parietal lamella and lacking a palatal tooth.

Figures

Figure 3. Angustopila occidentalis, specimen CUMZ 14389 from Taunggyi City, Shan State A, B specimen with four whorls and pronounced sculpture C, D specimen CUMZ 14390 with five whorls and weak or eroded sculpture.

Figure 13. Synoptic view of representatives of hypselostomatid snails recorded from Myanmar A Acinolaemus dayanum, specimen HA Collection B Acinolaemus cryptidentatus, specimen CUMZ 14413 C Anauchen eotvosi, holotype NHMUK 1903.7.1.1227.1 (after Pall-Gergely 2023 a: fig. 1 c) D Angustopila occidentalis, holotype HNHM 103483 (after Pall-Gergely et al. 2023: fig. 70 a) E Angustopila elevata, specimen HNHM 103484 (after Pall-Gergely et al. 2023: fig. 13 a) F Bensonella salwiniana, specimen CUMZ 14393 G Bensonella anguloobtusa, specimen CUMZ 14400 H Bensonella taiyaiorum sp. nov., paratype CUMZ 14403 I Bensonella lophiodera sp. nov., paratype CUMZ 14405 J Clostophis sankeyi, holotype UMZC I. 103320 (after Preece et al. 2022: fig. 70 e) K Clostophis thinbowguensis, holotype MNHN-IM- 2000 - 38057 (after Pall-Gergely et al. 2022: fig. 9 c) L Gyliotrachela bensonianum, syntype NHMUK 20191141 (after Gojsina et al. 2022: fig. 4 a) M Gyliotrachela hungerfordiana, specimen NHMUK collection from Perak, Malaysia N Gyliotrachela tianxingqiaoensis, holotype IZCAS TM 025075 (after Gojsina et al. 2022: fig. 3 a) O Gyliotrachela muangon, specimen CUMZ 14410 P Gyliotrachela aunglini sp. nov., paratype CUMZ 14412 Q Hypselostoma tubiferum, specimen NHMUK 1888.12.4.17 - 22 ex. Theobald collection from Tonduong, Burma.