Humboldt's squirrel monkey (''Saimiri cassiquiarensis'') is a species of

squirrel monkey Squirrel monkeys are New World monkeys of the genus ''Saimiri''. ''Saimiri'' is the only genus in the subfamily Saimiriinae. The name of the genus is of Tupi origin (''sai-mirím'' or ''çai-mbirín'', with ''sai'' meaning 'monkey' and ''mirím' ...

from

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

Colombia Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuel ...

Ecuador Ecuador, officially the Republic of Ecuador, is a country in northwestern South America, bordered by Colombia on the north, Peru on the east and south, and the Pacific Ocean on the west. It also includes the Galápagos Province which contain ...

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

and

Venezuela Venezuela, officially the Bolivarian Republic of Venezuela, is a country on the northern coast of South America, consisting of a continental landmass and many Federal Dependencies of Venezuela, islands and islets in the Caribbean Sea. It com ...

. It had previously been considered a subspecies of the

common squirrel monkey Common squirrel monkey is the traditional common name for several small squirrel monkey species native to the tropical areas of South America. The term common squirrel monkey had been used as the common name for ''Saimiri sciureus'' before gene ...

, ''S. scuireus'', but was elevated to full species status based on a genetic study by Carretero-Pinzón in 2009. A genetic study by Jessica Lynch Alfaro, ''et al'' indicated that the

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'', b ...

may be synonymous with ''Saimiri cassiquiarensis''. As of 2018, the Ecuadorian squirrel monkey is generally regarded as a subspecies of Humboldt's squirrel monkey, ''S. cassiquiarensis macrodon''. Humboldt's squirrel monkey have a head and body length of between with a tail between . Its coloration is similar to that of the

Guianan squirrel monkey The Guianan squirrel monkey (''Saimiri sciureus'') is a species of squirrel monkey from Guiana, Venezuela and Brazil. ''S. sciureus'' formerly applied to Humboldt's squirrel monkey and Collins' squirrel monkey, but genetic research in 2009 and ...

but the fur on the base of the crown is golden yellow as compared with gray for the Guianan squirrel monkey. It eats fruits when available, primarily between January and June, and also eats insects.

References

{{Taxonbar, from1=Q60607308, from2=Q20719822 Squirrel monkeys Mammals described in 1840 Mammals of Ecuador Mammals of Colombia Mammals of Peru Primates of Brazil Mammals of Venezuela Taxa named by René Lesson