Additionally, a Pleistocene gavialoid found on Woodlark Island of Papua New Guinea was initially named Gavialis papuensis in 1905, but has since been proposed to be a member of Ikanogavialis,[4] although the poor quality of the preserved material makes it difficult to determine.

The strata of the Urumaco formation were deposited in both marine and fluvial settings, although it is unclear to which portion both genera belong.

[7][8] Ikanogavialis also existed with many other crocodilians in Venezuela during the late Miocene including the giant caiman Purussaurus and an extinct species of Melanosuchus.

[9] "Gavialis" / Ikanogavialis papuensis was similarly fully marine, having been found in association with sea turtles and sirenians.

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