Ka cika wannan jumla: Nau'in nau'in "Gryposuchus" shi ne "G. jessei", wanda aka kira bisa ga rostrum mai kyau wanda aka tattara a gefen Kogin Pauini na Brazil a 1912. Wataƙila an lalata samfurin a lokacin Yaƙin Duniya na II ta
1943 fashewar bam na Hamburg. An gano wani samfurin da ake kira UFAC 1272, wanda ya ƙunshi premaxilla da maxilla, a cikin yankin Sena Madureia da ke kusa da ƙarshen Miocene Solimões Formation, a cikin 1997 kuma an ambaci nau'in a cikin 1997. "G. jessei" kuma ana nufin daga Tsarin Urumaco na arewa maso yammacin Venezuela. Wani nau'in nau'i na biyu, "G. neogaeus", an kira shi zuwa ga jinsin a shekarar 1982; an fara bayyana samfurori daga wannan nau'in daga ƙarshen Miocene Ituzaingó Formation na Argentina a 1885, kodayake an kira shi "Rhamphostomopsis" a lokacin.