Rishetia nathiana ( Godwin-Austen, 1920 ) Man & Ablett & Lwin & Sutcharit & Panha, 2024

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

34 Rishetia nathiana ( Godwin-Austen, 1920) comb. nov.

Fig. 14 H, I

Glessula (Rishetia) nathiana Godwin-Austen, 1920: 54, 55. Type locality: Bassein District [Pathein District, Ayeyarwady Region, Myanmar].

Type specimens.

Syntypes NHMUK 1906.1. 1.2206 [re-registered in error as 1986018] (5 shells; Fig. 14 H, I ) ex. Blanford collection from Bassein District .

Diagnosis.

Shell elongate turreted and regularly attenuated; apex rounded and blunt; subsequent whorls with very fine equally spaced radial ridges, which coarser near suture. Suture impressed and whorls flattened convex. Aperture broadly ovate; columella concave and truncated.

Distribution.

Rishetia nathiana is known only from the type locality and is likely endemic to that region.

Remarks.

Godwin-Austen clearly stated that the original description was based on a specimen lot, ex. W. T. Blanford collection with the catalogue number ‘ Type No. 2206.06. 1.1 B. M. ’. The NHMUK collections contain a lot of five specimens from the Godwin-Austen ex. Blanford collection with original label ‘ Type’ and ‘ ex. duplicate collection’. The specimen matches well with the given shell measurements, and the original description is illustrated herein for the first time.

Figures

Figure 14. A – C Rishetia burrailensis maxwelli A, B specimen NHMUK 1903.7. 1.3742 from Somra Tracts, Somra Khulen Post, Burma and C specimen NHMUK 1903.7. 1.3744 from Somra Tracts, Somra Khulen Post, Burma D Rishetia hastula, neotype NHMUK 1906.1. 1.880 from Darjiling E, F Rishetia kentungensis, syntypes NHMUK 1903.7. 1.3650 from Mong Sing, Siam Boundary G Rishetia limborgi, holotype NHMUK 1903.7. 1.3200 from Tenasserim H, I Rishetia nathiana, syntypes NHMUK 1906.1. 1.2206 from Bassein District.