Tonkinospira pulverea (Bavay & Dautzenberg, 1909)

Páll-Gergely, Barna, Grego, Jozef, Vermeulen, Jaap J., Reischütz, Alexander, Hunyadi, András & Jochum, Adrienne, 2019, New Tonkinospira Jochum, Slapnik & Páll-Gergely, 2014 species from Laos and Vietnam (Gastropoda: Pulmonata: Hypselostomatidae), Raffles Bulletin of Zoology 67, pp. 517-535 : 527-529

Tonkinospira pulverea (Bavay & Dautzenberg, 1909)

( Fig. 9 )

Helix (Systenostoma) pulverea Bavay & Dautzenberg, 1909a: 243 . (type locality: Phu-Quoc-Oai [see remarks under T. pauperrima ])

Helix (Systenostoma) pulverea — Bavay & Dautzenberg, 1909b: 194–195, pl. 8, figs 7–9.

Systenostoma pulverea — Pilsbry, 1917: 225, Plate 38, figs 10–12.

Tonkinospira pulverea — Jochum et al., 2014: 36 , fig. 3.

Types examined: 1 shell, syntype (H: 2.05 mm, D: 2.15 mm, Fig. 9 ) (MNHN-IM-2000-32863), Phu-Quoc-Oaï, coll. Demange.

Diagnosis. A large Tonkinospira species with a depressedconical shell, rounded body whorl, dense spiral striation, and a peristome that is adnate to penultimate whorl.

Description. Shell large for the genus; depressed-conical with very slightly, bluntly shouldered body whorl; whorls slightly more than 4, regularly increasing; suture deep; penultimate whorl widest from standard apertural view; protoconch consists of slightly more than one whorl, roughly rugose, and strongly spirally striated; teleoconch with very rough, irregular, radial growth lines, and dense, irregular spiral striation, ca. 36 in number in the middle shell line from apertural view; aperture oblique to shell axis and in alignment with the penultimate whorl from lateral view; aperture wide, circular; peristome not expanded and not reflected (although the holotype might be a subadult shell); aperture adnate to penultimate whorl; umbilicus narrow, partly covered by peristome.

Differential diagnosis. The most similar Tonkinospira species is T. depressa (for differences, see under that species). Otherwise, members of the genus Krobylos Panha & J.B. Burch, 1999 are similar in shell shape.

Remarks. For the type locality see T. pauperrima .

Figures

Fig. 9. Tonkinospira pulverea (Bavay & Dautzenberg, 1909), MNHN-IM-2000-32863 (syntype).