A, B map showing the geographical distribution of all known Songkhlanaia species (circles) and their type locality (stars). Map was generated using QGIS v. 3.36.0 with the outline of major river basins from the Freshwater Ecoregions of the World (Abell et al. 2008), river and lake topology from the HydroSHEDS database (https://www.hydrosheds.org), and the map raster data from the NASA EARTHDATA (https://www.earthdata.nasa.gov/).