The type species of "Gryposuchus" is "G. jessei", named based on a well-preserved rostrum collected along the Pauini River of Brazil in 1912. The specimen was probably destroyed during World War II by the 1943 bombing of Hamburg. Another specimen named UFAC 1272, consisting of a premaxilla and maxilla, was discovered in the nearby Sena Madureia locality of the late Miocene Solimões Formation, in and referred to the species in 1997. "G. jessei" is also referred to from the Urumaco Formation of northwestern Venezuela. A second species, "G. neogaeus", was referred to the genus in 1982; specimens from this species were first described from the late Miocene Ituzaingó Formation of Argentina in 1885, although it was referred to "Rhamphostomopsis" at the time.