The Guianan Squirrel is distributed in the Amazon Basin east of the rio Negro and the rio Madeira with a disjunct population in the Atlantic Rain Forest of eastern Brazil. It is found in forest, often near treefalls, and gardens

Identification is helped by the fact that it is usually the only squirrel in its range. The sub-species pictured here and found in eastern Brazil is S. a. ingrami which is olivaceous above and whitish to buff below.