Location of the type localities of all known species of Dixonius. The inset delimits the study area. 1 Dixonius aaronbaueri from Ninh Thuan Province, Vietnam; 2 D. dulayaphitakorum from Ranong Province, Thailand; 3 D. mekongensis from Ubon Ratchathani Province, Thailand; 4 D. hangseesom from Kanchanaburi Province, Thailand; 5 D. kaweesaki from Prachuap Khiri Khan Province, Thailand; 6 D. pawangkhananti from Phetchaburi Province, Thailand; 7 D. lao from Khammouane Province, Laos; 8 D. melanostictus from Nakhon Ratchasima Province, Thailand; 9 D. minhlei from Dong Nai Province, Vietnam; 10 D. siamensis from SaraBuri and Nakhon Ratchasima provinces, Thailand; 11 D. somchanhae from Vientiane Capital, Laos; 12 D. taoi from Binh Thuan Province, Vietnam; 13 D. vietnamensis from Khanh Hoa Province, Vietnam; 14 D. muangfuangensis sp. nov. from Vientiane Province, Laos; 15 D. gialaiensis sp. nov. from Gia Lai Province, Vietnam.