Ecuadorian squirrel monkey

The Ecuadorian squirrel monkey (Saimiri cassiquiarensis macrodon) is a type of squirrel monkey. It had been considered a subspecies of the Guianan squirrel monkey, Saimiri sciureus, but was elevated to a full species, S. macrodon, based on a 2009 study by Carretero-Pinzón, et al. Based on subsequent genetic research by Jessica Lynch Alfaro, et al it was again reclassified as a subspecies of Humboldt's squirrel monkey.

The Ecuadorian squirrel monkey lives in the western Brazilian Amazon, as well as southern Colombia, eastern Ecuador and northern and eastern Peru. It lives in humid tropical and subtropical forest, preferring dense forest but able to live in secondary forest and disturbed forest as well. It can live at elevations up to 1200 m, but where it has been studied in Ecuador it prefers elevations under 500 m.

The Ecuadorian squirrel monkey has a head and body length of between 25 and 32 cm with a tail length between 34 and 44 cm. Males weigh between 885 and 1380 g and females weigh between 590 and 1150 g. Its coloration is similar to that of the Guianan squirrel monkey but its fur is darker.