Glessula feddeni Godwin-Austen, 1920

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

10 Glessula feddeni Godwin-Austen, 1920

Fig. 6 , Table 1

Glessula feddeni Godwin-Austen, 1920: 58, pl. 162, fig. 15. Type locality: Shan Hills [Shan State, Myanmar].

Glessula feddeni var. — Godwin-Austen 1920: 58, pl. 163, fig. 14.

Type specimens.

Syntypes NHMUK 1906.2. 2.261 [re-registered in error as 1985142] (5 shells; Fig. 6 A, B ) ex. Blanford ex. Godwin-Austen collection from the Shan Hills, E. of Ava.

Other material.

NHMUK 1906.3. 3.41 (1 shell; Fig. 6 C ) ex. Blanford ex. Fedden collection labelled as ‘ var. ’ from the Shan Hills. Limestone hills (Apache Cement Factory), Pyinyaung Village, Meiktila District, Mandalay Region, Myanmar (20 ° 49 ' 39.1 " N, 96 ° 23 ' 35.1 " E): CUMZ 13068 (8 shells; Fig. 6 D – F ).

Description.

Shell globosely conical, solid, glossy, brownish colour, and with 6 ½ – 7 whorls. Apex slightly pointed; protoconch ~ 2 whorls with smooth surface; subsequent whorls with strong, oblique, and equally spaced radial grooves that more distinct near suture. Spire attenuated, turreted and pointed; whorls flatly convex; suture deep; last two whorls almost equal and largest. Aperture narrowly and obliquely ovate; parietal wall straight; peristome white and thickened; columella short, concave, slightly twisted, and truncated. Umbilicus closed.

Distribution.

This species was originally described from ‘ Shan Hills’, but the precise type locality was not provided. In this study, G. feddeni was located in the Mandalay Region adjacent to the Shan Hills.

Remarks.

Godwin-Austen (1920) clearly states the catalogue number ‘ Type No. 261.06.2.2 ’ ( NHMUK 1906.2. 2.261) from the Shan Hills. The original description included an illustration and two sets of measurements. The Godwin-Austen’s type lot in the NHMUK consists of five shells with an original handwritten label stating ‘ Type’. The two specimens with the largest shell height closest to the given measurements are here illustrated together with another shell from the syntype lot.

Godwin-Austen (1920: 58, pl. 163, fig. 14) also recognised another variety as ‘ var. ’ and illustrated specimen lot ‘ No. 41.06.3.3 ’ ( NHMUK 1906.3. 3.41). Nevertheless, this entity has never been properly made available. The specimen lot NHMUK 1906.3. 3.41 (Fig. 6 C ) labelled as ‘ var. ’ is excluded from the type series of this nominal species ( ICZN 1999: Art. 72.4. 1). However, this specimen has a more slender shell than the type series (Fig. 6 A, B ) and is possibly more closely related to G. latestriata , which is also distributed in the Shan State.

Figures

Figure 6. A – F Glessula feddeni A, B syntypes NHMUK 1906.2. 2.261 from Shan Hills, E. of Ava C specimen NHMUK 1906.3. 3.41 from Shan Hills and D – F specimen CUMZ 13068 from Pyinyaung Village, Mandalay Region, Myanmar.