Pristobrycon maculipinnis,[1] sometimes known as the marbled piranha,[2] is a species of serrasalmid endemic to Venezuela.

P. maculipinnis mainly inhabits black or clear acidic waters in the Orinoco basin in the state of Amazonas in Venezuela.

The body of P. maculipinnis is discoid to oval with the anterodorsal slightly convex.

The body of P. maculipinnis is a metallic greyish color adorned with many dark spots, giving the species a marbled appearance, although the abdominal area can be dark red or orange in color.

The fins of the species are generally red or orange in color and may also display dark spots.