| Named By: | R. SalasinGismondi, J. J. Flynn, P. Baby, J. V. TejadainLara, F. P. Wesselingh & P.inO. Antoine in 2015 |
| Time Period: | Mid Miocene (Laventan)~13 Ma |
| Location: | Peru - Pebas Formation |
| Size: | Estimated about 1.5-1.7 meters long |
| Diet: | Carnivore/Durophagous |
| Fossil(s): | Partial skull |
| Classification: | | Chordata | Reptilia | Crocodylomorpha | Crocodilia | Alligatoridae | Caimaninae | |
Gnatusuchus is an extinct genus of caiman represented by the type species Gnatusuchus pebasensis from the Middle Miocene Pebas Formation of Peru. Gnatusuchus lived about 13 million years ago (Ma) in a large wetland system called the Pebas mega-wetlands that covered over one million square kilometers of what is now the Amazon Basin (the modern basin had not yet developed at that time and instead of draining from west to east into the Atlantic Ocean, river systems drained northward through the wetlands and into the Caribbean Sea).