Glessula latestriata von Möllendorff, 1899

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

13 Glessula latestriata von Möllendorff, 1899

Fig. 8 A – D , Table 1

Glessula latestriata von Möllendorff, 1899: 166. Type locality: Kalow, Shan State [Kalaw Township, Taunggyi District, Shan State, Myanmar]. Beddome 1906: 172. Pilsbry 1909: 100. Gude 1914: 443. Godwin-Austen 1920: 59. Solem 1966: 93, 94, pl. 2, fig. e. Zilch 1973: 110, pl. 5, fig. 26. Inkhavilay et al. 2019: 49, fig. 20 c, d.

Type specimens.

Lectotype SMF 145919 / 1 (Fig. 8 A ) designated in Zilch (1973: pl. 5, fig. 26) from Kalow, Shan States . Paralectotypes SMF 227513 / 2 (2 shells) and NHMUK 1926.2. 3.19–20 (2 shells; Fig. 8 B ) from Kalow, Shan States.

Other material.

Thale Cumon Temple, Kalaw City, Shan State, Myanmar (20 ° 43 ' 24.1 " N, 96 ° 35 ' 38.9 " E): CUMZ 13070 (3 shells; Fig. 8 C ). Ywangan Village, near Lin Way Monastery, Kalaw Township, Taunggyi District, Shan State, Myanmar (21 ° 13 ' 43.3 " N, 96 ° 33 ' 19.2 " E): CUMZ 13071 (1 shell; Fig. 8 D ).

Description.

Shell ovate conic, solid, glossy, brownish colour, and with 6 ½ – 7 whorls. Apex blunt; protoconch ~ 2 whorls with smooth to shallow radial grooves; subsequent whorls with distinctly thickened and equally spaced grooves. Spire gradually attenuated, slightly turreted, and bluntly pointed; whorls convex; suture deep; last two whorls almost equal and largest. Aperture narrow and obliquely ovate; peristome white and thickened; columella short, concave, slightly twisted, and truncated. Umbilicus closed.

Distribution.

This species is known from Shan State in Myanmar, northern Thailand, and Laos ( Gude 1914; Solem 1966; Inkhavilay et al. 2019).

Remarks.

von Möllendorff (1899) described this species based on specimens collected by B Strubell from Shan State, Myanmar. The original description did not include any illustrations, and only one set of measurements was given. The species description was not explicitly based on one specimen. Nevertheless, Zilch (1973: 110) later used the terms ‘ Holotypus SMF 145919 ’ and ‘ Paratypen SMF 227513 / 2 ’ for the von Möllendorff type series in the SMF collection. This is not a valid holotype designation, but we consider it an inadvertent lectotype designation ( ICZN 1999: Arts. 73.1, 74.5, and Recommendation 73 F). The other specimens labelled as ‘ Paratypen SMF 227513 / 2 ’ and ‘ Co-types NHMUK 1926.2. 3.19–20 ’ are considered paralectotypes.

Although both G. latestriata and G. feddeni possess radial grooves striations, the former has a slender shell, gradually attenuated spire, and blunter apex; in contrast, G. feddeni has a larger and broader shell, turreted, intermediately attenuated spire and pointed apex with abruptly truncate columella.

Figures

Figure 8. A – D Glessula latestriata A lectotype SMF 145919 from Kalow, Shan States B paralectotypes NHMUK 1926.2. 3.19–20 from Kalow, Shan States C specimen CUMZ 13070 from Thale Cumon Temple, Kalaw, Shan State, Myanmar and D specimen CUMZ 13071 from Ywangan Village, Kalaw, Shan State, Myanmar E, F Glessula mandalayensis sp. nov. E holotype CUMZ 13072 from Pyinyaung Village, Mandalay Region, Myanmar and F paratypes CUMZ 13073 from the type locality. Photograph: Gojšina & Páll-Gergely (A).