Seven new hypselostomatid species from China, including some of the world's smallest land snails (Gastropoda, Pulmonata, Orthurethra)

Seven new species of Hypselostomatidae are described from the Chinese province Guangxi: Angustopila dominikae Pall-Gergely & Hunyadi, sp. n., A. fabella Pall-Gergely & Hunyadi, sp. n., A. subelevata Pall-Gergely & Hunyadi, sp. n., A. szekeresi Pall-Gergely & Hunyadi, sp. n., Hypselostoma socialis Pall-Gergely & Hunyadi, sp. n., H. lacrima Pall-Gergely & Hunyadi, sp. n. and Krobylos sinensis Pall-Gergely & Hunyadi, sp. n. The latter species is reported from three localities. All other new species are known only from the type locality. Specimens nearly identical to the type specimens of Angustopila huoyani Jochum, Slapnik & Pall-Gergely, 2014 were found in a cave in northern Guangxi, 500 km from the type locality. Adult individuals of Angustopila subelevata sp. n. (shell height = 0.83-0.91 mm, mean = 0.87 mm) and A. dominikae sp. n. (shell height of the holotype = 0.86 mm) represent the smallest known members of the Hypselostomatidae, and thus are amongst the smallest land snails ever reported. We note that Pyramidula laosensis Saurin, 1953 might also belong to Krobylos. Paraboysidia neglecta van Benthem Jutting, 1961, which was previously included in Angustopila, is classified in Hypselostoma.