Distribution map of Amphidromus samples recognised in this study. 1. Amphidromus bozhii; 2. Amphidromus placostylus; 3. Amphidromus asperoides sp. nov.; 4. Amphidromus ingens; 5. Amphidromus ingensoides sp. nov.; 6. Amphidromus buelowi; 7. Amphidromus thachi; 8. Amphidromus metabletus; 9. Amphidromus haematostoma; 10. Amphidromus madelineae; 11. Amphidromus costifer; 12. Amphidromus pankowskianus; 13. Amphidromus roseolabiatus. Species numbers correspond to those in Fig. 2 and Tables 1, 2. The map was produced using QGIS (3.16.0) with SRTM Downloader plugin (https://github.com/hdus/SRTM-Downloader), retrieving SRTM data from NASA Earth Data server (https://urs.earthdata.nasa.gov/).