In 2000, Brochu and Gingerich argued that T. gavialoides, T. kerunense and T. tenuirostre are all junior synonyms of Eogavialis africanum, since they're morphologically indistinguishable with the only difference in stratigraphic position.

[1] A third species was assigned to Eogavialis in 2003 from material found in the 1990s from the lower Nawata Formation of the Turkana basin outcropping in Lothagam, Kenya.

However, this characteristic has since been shown to be present in other extinct gavialids, meaning that premaxilla and nasal contact is a plesiomorphic trait of all tomistomines, including basal ones.

[13] The trend for a long, narrow rostrum developing progressively over time as seen in Eogavialis has been used to suggest that the genus was a direct ancestor of Gavialis.

[12] Eogavialis africanum was included in the study on the phylogenetic relationships of putative fossil gavialoids published by Lee & Yates (2018).

The authors considered it most likely that E. africanum was not a gavialoid, or even a crocodylian, but rather a member of the clade of non-crocodylian eusuchians that also included the genera Argochampsa, Eosuchus, Eothoracosaurus and Thoracosaurus.

The area of the Gebel Qatrani Formation in the Faiyum Depression where most of the well-preserved specimens of E. africanum and E. gavialoides were found was also deposited in a fluvial paleoenvironment, although much older.

Other fossils found from the formation include those of turtles, crocodiles, hyaenodontids, proboscideans such as Phiomia, Palaeomastodon, and Moeritherium, the Embrithopodan Arsinoitherium, numerous species of hyraxes, artiodactyls, as well as some of the earliest simian primates such as Apidium, Catopithecus, Oligopithecus, and Aegyptopithecus.