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The species of the genus Leiosoma Stephens, 1829 close to Leiosoma cribrum (Gyllenhal, 1834) are reviewed. The Leiosoma cribrum species group is proposed. Leiosoma cribrum (Gyllenhal, 1834) and Leiosoma concinnum Boheman, 1842 are redescribed; lectotypes are designated for both species. Neotypes are designated for Liosoma carpathicum Brancsik, 1899 and Liosoma isabellae Tschapeck, 1874. Four new species are described: Leiosoma diottii n.sp. (southern Italy), Leiosoma komovicum n.sp. (Montenegro), Leiosoma kostali n.sp. and Leiosoma senex n.sp. (Romania). A key to the species of the group is provided. Observations on the ecology and remarks for each species are reported. The species of the Leiosoma cribrum group are mostly spread over high-mountain ecosystems.
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