Bacillum obtusum ( Blanford, 1869 )

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

2 Bacillum obtusum ( Blanford, 1869)

Fig. 3 E – H

Achatina (Glessula) obtusa Blanford, 1869: 449. Type locality: Bhamo in regno Avae [Bhamo District, Kachin State, Myanmar].

Achatina (Bacillum) obtusa — Hanley and Theobald 1870: 17, pl. 36, fig. 6.

Achatina obtusa — Pfeiffer 1876: 290.

Glessula obtusa — Nevill 1877: 25.

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

Bacillum obtusum — Pilsbry 1906: 1, 2, pl. 1, fig. 1. Gude 1914: 347.

Type specimens.

Syntypes NHMUK 1906.2. 2.349 [re-registered in error as 19850143] (4 shells; Fig. 3 E, F ) ex. Blanford collection from Bhamo, Upper Burmah.

Other material.

NHMUK 1903.7. 1.1725 (2 shells + 1 juvenile; Fig. 3 G, H ) ex. Godwin-Austen collection from Bhamo, Upper Burma. NHMUK 18 / 88.12. 4.1012–1014 (3 shells) from Bhamo. NHMUK (1 shell) ex. TV Oldham collection from Bhamo, Burma. SMF 145947 / 2 (2 shells) ex. von Möllendorff collection from Bhamo.

Diagnosis.

Shell slender, elongate turreted and apical whorls rapidly attenuated; apex rounded, blunt and very large embryonic shell; subsequent whorls with fine radial striae. Suture shallow and whorls flattened. Aperture obliquely subovate; columella curved and truncated.

Distribution.

This species is known only from the type locality.

Remarks.

No new material of this species was collected in this study, but the syntypes are illustrated for the first time.

Figures

Figure 3. A – D Allopeas gracile A lectotype NHMUK 1856.09. 15.68 / 1 from Mirzapore B paralectotypes NHMUK 1856.09. 15.68 / 2–11 and C, D specimen CUMZ 13066 from Mandalay Region, Myanmar with embryonic whorls and aperture E – H Bacillum obtusum E, F syntype NHMUK 1906.2. 2.349 from Bhamo, Upper Burmah G, H specimen NHMUK 1903.7. 1.1725 from Bhamo, Upper Burma and H juvenile shell with last whorl I Bacillum theobaldi, syntype NHMUK 1912.4. 16.121 from Burmah with last whorl.