Rishetia baculina ( Blanford, 1871 ) 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

28 Rishetia baculina ( Blanford, 1871) comb. nov.

Fig. 13 D

Glessula baculina Blanford, 1871: 43, 44, pl. 2, fig. 6. Type locality: Khersiong Himalayae Sikkimensis. Beddome 1906: 160. Gude 1914: 379, 380. Godwin-Austen 1920: 14–16, pl. 159, fig. 7. Ramakrishna et al. 2010: 153.

Achatina (Electra) baculina — Hanley and Theobald 1873: 33, pl. 78, fig. 6.

Achatina baculina — Pfeiffer 1876: 291.

Stenogyra (Glessula) baculin a — Nevill 1878: 170.

Stenogyra (Subulina) baculina — Pfeiffer and Clessin 1881: 327.

Glessula tenuispira var. baculina — Pilsbry 1909: 88, 89, pl. 9, fig. 2.

Type specimens.

Syntypes NHMUK 1909.3. 15.9 [re-registered in error as 19850144] (3 shells; Fig. 13 D ) ex. Godwin-Austen ex. Blanford collection from Kursiong, Darjiling .

Diagnosis.

Shell slender, elongate turreted and rapidly attenuated; apex rounded; subsequent whorls with fine and equally spaced radial ribs throughout. Suture impressed and whorls slightly convex. Aperture obliquely ovate; columella strong, concave, and truncated.

Distribution.

This species was originally discovered in India and later reported from the Magway Region, Myanmar ( Godwin-Austen 1920).

Remarks.

Godwin-Austen (1920: 15) stated that specimens identified to this species in the Beddome collection were collected from ‘ Thyet Myo’ [Thayet District, Magway Region]. However, the Myanmar specimens show noticeable differences from the type specimens in having a more attenuated apex, and larger and broader aperture.

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.