The millipede family Polydesmidae Leach, 1816 (Diplopoda, Polydesmida) from Vietnam, with a description of a new cavernicolous species Author Nguyen, Anh D. https://orcid.org/0000-0001-9273-0040 Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18, Hoangquocviet Rd., Caugiay District, Hanoi, Vietnam & Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18, Hoangquocviet Rd., Caugiay District, Hanoi, Vietnam ducanh410@yahoo.com Author Vu, Tam T. T. https://orcid.org/0000-0003-1145-975X Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18, Hoangquocviet Rd., Caugiay District, Hanoi, Vietnam Author Eguchi, Katsuyuki https://orcid.org/0000-0002-1054-1295 Graduate School of Science, Tokyo Metropolitan University, Minami-osawa 1 - 1, Hachioji, Tokyo 192 - 0397, Japan & Department of International Health and Medical Anthropology, Institute of Tropical Medicine, 1 - 12 - 4 Sakamoto, Nagasaki University, Nagasaki, 852 - 8523, Japan text ZooKeys 2024 2024-01-30 1190 259 280 http://dx.doi.org/10.3897/zookeys.1190.114958 journal article http://dx.doi.org/10.3897/zookeys.1190.114958 1313-2970-1190-259 A5D5D928CE844E13BC31ED2393B3403D 76BAA6C26E1A559E8597D66C26B690E4 Genus Polydesmus Latreille, 1802-1803 Type species. Julus complanatus Linnaeus, 1761, by monotypy. Remarks. Polydesmus is certainly the largest genus within the family Polydesmidae , with over 200 species and subspecies which mainly occur in Europe and the Mediterranean, west of the central Caucasus ( Hoffman 1980 ; Djursvoll et al. 2001 ). A few species have been found in the Oriental Region, these being Polydesmus japonicus Miyosi, 1956, P. miyosii Murakami, 1966, P. tanakai Murakami, 1970, and P. tangonis Murakami, 1973 from Japan; P. moorei Pocock, 1895 and P. paludicola Pocock, 1895 from eastern China; P. liber Golovatch, 1991 from Hong Kong, southern China ( Golovatch 1991 ); and P. vietnamicus Nguyen, 2009, the only species of the genus from northern Vietnam ( Nguyen 2009 ). The two old species of Pocock (1895) from mainland China are only provisionally to be assigned to Polydesmus , as both require revision. The distribution of Polydesmus seems to be amphi-Palaearctic ( Golovatch 1991 ).