Glessula peguensis ( Blanford, 1865 )

Man, Nem Sian, Ablett, Jonathan D., Lwin, Ngwe, Sutcharit, Chirasak & Panha, Somsak, 2024, Contributions on a small collection of the former Subulinidae Fischer & Crosse, 1877 (Eupulmonata, Achatinoidea) with catalogue of the Glessula and Rishetia species recorded from Myanmar, ZooKeys 1208, pp. 173-239 : 173-239

16 Glessula peguensis ( Blanford, 1865)

Fig. 10 B, C

Achatina peguensis Blanford, 1865: 78. Type locality: Irawady valley, Pegu [Ayeyarwady valley, Bago Region, Myanmar]. Pfeiffer 1868: 228. Hanley and Theobald 1874: 41, pl. 102, fig. 6.

Glessula peguensis — Theobald and Stoliczka 1872: 334. Pfeiffer and Clessin 1881: 331. Beddome 1906: 171. Pilsbry 1909: 99, pl. 13, fig. 12. Gude 1914: 438. Godwin-Austen 1920: 55, 56, pl. 162, figs 20, 21.

Stenogyra (Glessula) peguensis — Nevill 1878: 171.

Type specimen.

The type specimen could not be located in the NHMUK collection.

Other material.

NHMUK 1909.3. 15.8 (3 shells; Fig. 10 B, C ) ex. Blanford collection from Thyet-Myo. NHMUK 20230920 ex. H. B. F. collection (4 shells) from Thyet Myo. SMF 235657 / 2 (2 shells) from Pegu.

Diagnosis.

Shell oblong ovate and regularly attenuated; spire high conical; apex rounded and blunt; subsequent whorls with prominent regularly spaced radial ribs. Suture deeply impressed and whorls convex. Aperture widely ovate; columella strong, concave, and truncated.

Distribution.

Glessula peguensis is distributed in Bago Region, Magway Region, and Rakhine State in Myanmar, as well as in Chittagong, Bangladesh ( Gude 1914; Godwin-Austen 1920).

Remarks.

The specimen from ‘ Thyet-myo’, which is present in the Blanford collection with the original label as ‘ authentic’, is illustrated herein as an example of this species. According to Godwin-Austen (1920: 56), this species is commonly found in Pegu.

The original type locality of this species was from a broad geographical range, ‘ Pegu’, and the museum label stated Thyet-Myo as the collection locality. The reference to ‘ Pegu’ and ‘ Thyet-Myo’ on the original label needs to be clarified as to whether they refer to the same area or if there is a specific location in ‘ Thyet-Myo, Pegu’. The current administration area now includes ‘ Thyet-Myo’ [Thayet Myo] as a district of the Magway Region located in central Myanmar, formerly part of ‘ Pegu, Lower Burma’ during the British colonial period. Furthermore, Godwin-Austen (1920: 56) stated that additional specimens from ‘ Arakan near Tongoop’ (No. 262.06.2.2) tended to have a larger shell size than the type specimen.

Figures

Figure 10. A Glessula orophila, specimen NHMUK ex. Blanford collection from Mahableshwar B, C Glessula peguensis, specimen NHMUK 1909.3. 15.8 from Thyet-Myo D, E Glessula perlevis, syntypes NHMUK 1906.5. 5.89 from Shan Hills, Burma F Glessula ponsiensis, syntypes NHMUK 1989042 from Ponsee.