The sexual populations are located along the Rio Amazonas and the Rio Negro, suggesting the existence of a central widespread sexual (or facultatively sexual/asexual) population that has repeatedly generated asexual, clonally reproducing lineages although separated by as much as 2,000 km. These asexual lineages have quickly dispersed throughout a lot of Latin America, ultimately causing the present extensive geographical circulation associated with species (32, 33). The high ...