Abstract
Seven new species of Hypselostomatidae are described from the Chinese province Guangxi: Angustopila dominikae Páll-Gergely & Hunyadi, sp. n., Angustopila fabella Páll-Gergely & Hunyadi, sp. n., Angustopila subelevata Páll-Gergely & Hunyadi, sp. n., Angustopila szekeresi Páll-Gergely & Hunyadi, sp. n., Hypselostoma socialis Páll-Gergely & Hunyadi, sp. n., Hypselostoma lacrima Páll-Gergely & Hunyadi, sp. n. and Krobylos sinensis Páll-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 & Páll-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 Angustopila 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.
Highlights
The term “microsnail” usually refers to gastropods with shells smaller than 5 mm (Panha and Burch 2005)
Some of the new species reported in this study, especially the member of the genus Angustopila, have remarkably tiny shells
The smallest land snail presented in these literature is “Pupisoma sp.” from Thailand, measuring “about 0.9 mm in length” (Panha and Burch 2005)
Summary
The term “microsnail” usually refers to gastropods with shells smaller than 5 mm (Panha and Burch 2005) Species within this size range do not form a monophyletic unit. Microgastropods represent a large portion of worldwide and tropical land snail diversity Knowledge about their biodiversity is scant due to two main reasons: i) many microsnails are reported from caves only or known to inhabit rock outcrops, meaning that they can only be effectively collected using special techniques, such as sieving from soil samples; ii) many microsnails are reported from small ranges and often from the type locality only 1849 and Acinolaemus Thompson & Upatham, 1997 (Schileyko 1998a) These genera, together with Systenostoma Bavay & Dautzenberg, 1909 are sometimes included in the Pupillidae We highlight some difficulties in the pre-existing practice of ranking species into genera based on conchological characters
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