Map of Thailand showing the seven collection sites of the 15 species studied. 1. Amblyrhynchichthys micracanthus (Ng et Kottelat, 2004), Cyclocheilichthys armatus (Valenciennes 1842), Cyclocheilichthys repasson (Bleeker, 1853), Sikukia stejnegeri (Smith, 1931); 2. Cyclocheilos enoplos (Bleeker, 1849), Puntius brevis (Bleeker, 1849), Poropuntius laoensis (Günther, 1868); 3. Hampala macrolepidota (Kuhl et van Hasselt, 1823), Barbonymus altus (Günther, 1868), Barbonymus schwanenfeldii (Bleeker, 1854); 4. Barbonymus gonionotus (Bleeker, 1849), Hampala dispar (Smith, 1934); 5. Barbodes rhombeus (Kottelat, 2000); 6. Pethia stoliczkana (Day, 1871), and 7. Desmopuntius hexazona (Weber et de Beaufort, 1912). The map was produced using the software QGis 3.4.4 (https://qgis.org), Inkscape 0.92 (https://inkscape.org), and Adobe Photoshop CC 2015 (San Jose, CA, USA).