Glessula crassilabris ( Benson, 1836 )

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

9 Glessula crassilabris ( Benson, 1836)

Fig. 5 E, F

Achatina crassilabris Benson, 1836: 353. Type locality: N. E. Frontier of Bengal. Pfeiffer 1848: 261. Reeve 1850: Achatina, pl. 21, fig. 81. Pfeiffer 1853: 493. Pfeiffer 1860: 313, pl. 25, figs 12, 13. Benson 1860: 464. Blanford 1865: 95.

Oleacina (Electra) crassilabris — Adams and Adams 1855: 105.

Achatina (Electra) crassilabris — Pfeiffer 1856: 168. Hanley and Theobald 1870: 17, pl. 36, fig. 1.

Cionella (Glessula) crassilabris — von Martens 1860: 254.

Stenogyra (Glessula) crassilabris — Nevill 1878: 170.

Glessula crassilabris — Godwin-Austen 1876: 315. Pfeiffer and Clessin 1881: 330. Beddome 1906: 169. Pilsbry 1909: 96, pl. 10, figs 14, 16. Gude 1914: 426. Godwin-Austen 1920: 39, 40, pl. 160, figs 14, 17–20, pl. 164, figs 16, 17. Ramakrishna et al. 2010: 157. Preece et al. 2022: 122, fig. 51 e.

Type specimen.

Syntype UMZC I. 102430 (1 shell; Fig. 5 E after Preece et al. 2022: fig. 51 e) from Bengal.

Other material.

NHMUK (1 shell; Fig. 5 F ) from Cherrapoonji (M 10604 / 2). NHMUK 20200349 (2 shells) from N. E. Bengal. NHMUK 20200350 (2 shells) M. 10695 / 2 from Khasi.

Diagnosis.

Shell oblong ovate and regularly attenuated; spire high conical; apex rounded; subsequent whorls with weak and irregularly spaced radial ridges, slightly stronger near suture, and fine radial groves present. Suture impressed and whorls slightly convex. Aperture ovate; columella strong, concave, and truncated.

Distribution.

This species is known from India and Rakhine State, Myanmar ( Godwin-Austen 1920).

Remarks.

The taxonomic history and clarification status of the type specimens have recently been published in Preece et al. (2022). Blanford (1865: 95) reported a small variety of Glessula crassilabris based on specimens from ‘ Arakan’ [Rakhine State] and ‘ Shan hills near Ava’ [Shan Hills near Innwa], and also suggested that the latter specimen lot were possibly distinct from G. crassilabris s. s., although they were closely related. The following year, Godwin-Austen (1920) introduced the Shan hills specimens as G. feddeni Godwin-Austen, 1920 , but the small variety from ‘ Arakan’ has never been made available.

Figures

Figure 5. A – D Glessula blanfordiana A, B syntypes NHMUK 1988150 from Ponsee, Yunnan, W. China and C, D specimen CUMZ 13067 from Taunggyi, Shan State, Myanmar E, F Glessula crassilabris E syntype UMZC I. 102430 from Bengal (after Preece et al. 2022: fig. 51 e) and F specimen NHMUK from Cherrapoonji (M 10604 / 2).