https://conchsoc.org/sites/default/files/jconch/45/6/JC-45-6-975-801.pdf

Shaanxi Province is divided by the transition line between the vegetation zones of subtropical evergreen and temperate deciduous broadleaf forests, which sets a limit to northward expansion for members of the clausiliid subfamily Phaedusinae. Due to this constraint and a modest interest of malacologists only eight, mostly widespread clausiliid species have been recorded reliably from this province. Here we introduce Euphaedusa vitrea sp. nov., Streptodera chertoprudi sp. nov., and Streptodera qinlingensis sp. nov., which were found during a 2010 trip to the Qinling Mountains in southern Shaanxi. Intriguingly, the new Streptodera species are sinistral members of a genus that previously was considered monotypic and dextral. The three new, apparently narrow endemic species suggest a higher-than-expected diversity of clausiliids in the forested areas of southern Shaanxi.