Dark spiny tree-rat
The dark spiny tree-rat ("Echimys saturnus") is a species of rodent in the family Echimyidae. It is a rarely encountered and nocturnal species, found in eastern Ecuador and central Peru. As compared to "Echimys chrysurus", the main diagnostic character state of this "Echimys" species is the mostly black dorsal part of head and body. In addition, "E. saturnus" can be distinguished from "Echimys vieirai" by possessing a venter spotted with white while it is uniformly grayish brown in the latter species.