Rishetia akouktoungensis ( 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

27 Rishetia akouktoungensis ( Godwin-Austen, 1920) comb. nov.

Fig. 13 A – C

Glessula akouktoungensis Godwin-Austen, 1920: 55. Type locality: Akouktoung on Irawady, Pegu [Akauk Taung (hill), Pyay District, Bago Region, Myanmar].

Type specimens.

Syntypes NHMUK 1906.1. 1.2207 [re-registered in error as 1985138] (6 shells; Fig. 13 A – C ). ex. W. T. Blanford ex. Godwin-Austen collection from Akouktoung , Pegu .

Diagnosis.

Shell elongate, turreted, and regularly attenuated; apex rounded; subsequent whorls nearly smooth and with coarse radial ridges near suture. Suture impressed and whorls flattened convex. Aperture broadly ovate; columella strong, concave, and truncated.

Distribution.

The species is currently known from its type locality, in which the modern name is Akauk Taung [hill, ~ 18 ° 30 ' 33.7 " N, 95 ° 06 ' 48.5 " E], south of Htone Bo (or Tonbo) Village, Padaung Township, Pyay District, Bago Region].

Remarks.

The original description did not include an illustration, and only one set of measurements was given. Godwin-Austen’s description was based on one lot of specimens which clearly stated ‘ Type No. 2207.06. 1.1 B. M. ’ ( NHMUK 1906.1. 1.2207). There are six specimens from the NHMUK type collection with the original label stating ‘ Type’. The specimen that has a similar shell measurements as given in the original description and with pink wool inside the shell is figured herein (Fig. 13 A ). Other shells from the same syntype lot are also illustrated (Fig. 13 B, C ).

Figures

Figure 13. A – C Rishetia akouktoungensis, syntypes NHMUK 1906.1. 1.2207 from Akouktoung, Pegu D Rishetia baculina, syntypes NHMUK 1909.3. 15.9 from Kursiong, Darjiling E, F Rishetia basseinensis, syntypes NHMUK 1909.3. 15.19 from Bassein G – I Rishetia burrailensis maxwelli G holotype NHMUK 1903.7. 1.1717 / 1 from Naga Hills, East of Kohima H specimen NHMUK 1988147 from Somra Tracts, Somra Khulen Post, west of Kyengdwen River, Burma and I paratypes NHMUK 1903.7. 1.1717 / 2–4 from Naga Hills, East of Kohima.