Fossils of Piscogavialis have been found from the Mio-Pliocene Pisco Formation of the Sacaco Basin in southern Peru in 1998,[2] where it coexisted with the much smaller gavialid Sacacosuchus.

As the Peruvian sediments yielded bones of both adults and juvenile specimens, it is assumed that Sacacosuchus spent its entire life in saltwater.

[3] During the Miocene, environmental factors worked together to highly favor marine gavialoids, in particular warm temperatures and abundant shallow water coastal environments suited to their lifestyle.

Initially, both Piscogavialis and Sacacosuchus weren't heavily affected, with the water temperatures of their habitat continuing to support these ectotherms until at least the end of the Miocene period.

[3] A phylogenetic analysis conducted in a 2007 study found Gryposuchinae to include the genera Aktiogavialis, Gryposuchus, Ikanogavialis, Piscogavialis, and Siquisiquesuchus.