Fragments of Gnathosaurus jaw were first discovered in 1832 in the Solnhofen limestones of southern Germany but were mistaken for a piece of teleosaurid crocodile jaw, hence the synonym Crocodylus multidens.
Crocodylus anthropophagus was the largest predator encountered by human ancestors at Olduvai Gorge, as indicated by hominid specimens preserving crocodile bite marks from these sites.
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Crocodylus anthropophagus was first named by Christopher A. Brochu, Jackson Njau, Robert J. Blumenschine and Llewellyn D. Densmore in 2010.
The New Guinea crocodile was first described by the American herpetologist Karl Patterson Schmidt in 1928 as Crocodylus novaeguineae.
Buckland named "Crocodylus" spenceri on the basis of a partial skull found from the Isle of Sheppey in Kent, England.
Crocodylus mindorensis was considered locally extinct in part of its former range in Northern Luzon until a live specimen was caught in San Mariano, Isabela in 1999.