FIGURE 12 in A new species of Neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae) from the Rio Negro, Amazonas, Brazil: the smallest species of Potamotrygon

FIGURE 12. Maps showing distribution of Potamotrygon wallacei n. sp. in the Rio Negro basin (on left) and in the region near Barcelos (on right), upper Rio Negro basin, highlighting sampling efforts underway by one of us (MLG) since the mid-1990's (note that some collection localities occurred in small streams not indicated on map).