Another aspect clearly separating this pair of species is their
distribution, in which P. oaxacae is restricted to the upper part
of the río Verde basin, Oaxaca while P. punctatus inhabits the
lower part of the same basin. P. sp. nov. 1 also inhabits the upper
part of the río Verde basin, but shows a high genetic distinctiveness
regarding both, P. oaxacae and P. punctatus