Tropidauchenia giardi

Tropidauchenia giardi (Fischer, 1898) (Fig. 1A) Clausilia giardi Fischer, 1898: 323, fig. 2, pl. 18, figs 22–27 Type locality: Ma Phuc Pass (Cao Bang Province). Locality data: Tam Dao N. P. (Hoang et al. 2012). Distribution: In Vietnam, this species has been known from the provinces of Cao Bang (eastern part) and Lang Son (northern part). It also occurs in the neighbouring Longzhou County, Guangxi Province (China). Habitat: Limestone cliffs. Remark: The reported occurrence record from the Tam Dao N. P. (Hoang et al. 2012) is surprising because of the relatively large distance from the hitherto known distribution area of T. giardi. Furthermore, the predominantly volcanic Tam Dao Range and some of the habitats (i.e., wastelands and farmlands) reported by Hoang et al. (2012) are not suitable for this obligate limestone-dwelling species. Therefore, this locality information needs confirmation.