Glessula yuangensis Godwin-Austen, 1920

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

20 Glessula yuangensis Godwin-Austen, 1920

Fig. 11 F

Glessula yuangensis Godwin-Austen, 1920: 59, pl. 162, fig. 18. Type locality: Yuang Ha, Siam Boundary [Mong Yawng Township, Tachileik District, Shan State, Myanmar].

Type specimen.

Holotype NHMUK 1903.7 . 1.1312 [re-registered in error as 1986052] (Fig. 11 F ) collected by Woodthorpe ex. Godwin-Austen collection from Yuang Ha, Shan States.

Diagnosis.

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

Distribution.

The species is currently known only from its type locality.

Remarks.

Godwin-Austen clearly stated that this species was described based on only one specimen collected by R. Woodthorpe. The description included a set of shell dimensions and a shell illustration. There is one Godwin-Austen specimen lot, NHMUK 1903.7. 1.1312, that has an original label stating ‘ Type’ and is from the Woodthorpe collection. We recognise this specimen as the holotype fixed by monotypy. Additionally, Godwin-Austen seemed to consider another specimen lot, ‘ No. 1156 B. M. ’ ( NHMUK 1903.7. 1.1156) from Kentung State [Kengtung Township, Shan State], as a distinct entity and it is therefore excluded from the type series.

Originally, the type locality was said to be from ‘ Yuang Ha, Siam Boundary’; however, this town currently is found in the Shan State, Myanmar. The original type locality is now Mong Yawng Township, Shan State (~ 21 ° 10 ' 42.7 " N, 100 ° 21 ' 24.3 " E), Myanmar, with a further record from Kengtung, Shan State ( Godwin-Austen 1920: 59).

Figures

Figure 11. A, B Glessula ponsiensis A syntypes NHMUK 1989043 from Ponsee and B specimen NHMUK 1912.4. 16.747 from Ponsee, Yunnan C – E Glessula woodthorpei, syntypes NHMUK 1903.7. 1.1628 from Shan States F Glessula yuangensis, holotype NHMUK 1903.7. 1.1312 from Yuang Ha, Shan States.