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Vietnamese species from the family   Plectopylidae   are revised based on the type specimens of all known taxa, more than 600 historical non-type museum lots, and almost 200 newly-collected samples. Altogether more than 7000 specimens were investigated. The revision has revealed that species diversity of the Vietnamese   Plectopylidae   was previously overestimated. Overall, thirteen species names (anterides    Gude, 1909,bavayi    Gude, 1901,congesta    Gude, 1898,fallax    Gude, 1909,gouldingi    Gude, 1909,hirsuta    Möllendorff, 1901,jovia    Mabille, 1887,moellendorffi    Gude, 1901,persimilis    Gude, 1901,pilsbryana    Gude, 1901,soror    Gude, 1908,tenuis    Gude, 1901,verecunda    Gude, 1909) were synonymised with other species. In addition to these,    Gudeodiscus   hemmeni    sp. n.  and    G.   messageri   raheemi    ssp. n.  are described from north-western Vietnam. Sixteen species and two subspecies are recognized from Vietnam. The reproductive anatomy of eight taxa is described. Based on anatomical information,    Halongella    gen. n.  is erected to include    Plectopylis   schlumbergeri    and    P.   fruhstorferi   . Additionally, the genus    Gudeodiscus    is subdivided into two subgenera (   Gudeodiscus    and    Veludiscus    subgen. n. ) on the basis of the morphology of the reproductive anatomy and the radula. The Chinese    G.   phlyarius   werneri    Páll-Gergely, 2013 is moved to synonymy of    G.   phlyarius   . A spermatophore was found in the organ situated next to the gametolytic sac in one specimen. This suggests that this organ in the   Plectopylidae   is a diverticulum. Statistically significant evidence is presented for the presence of calcareous hook-like granules inside the penis being associated with the absence of embryos in the uterus in four genera. This suggests that these probably play a role in mating periods before disappearing when embryos develop.    Sicradiscus   mansuyi    is reported from China for the first time.

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Systematics of the family   Plectopylidae   in Vietnam with additional information on Chinese taxa (  Gastropoda  ,   Pulmonata  ,   Stylommatophora  )