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Sciurillus pusillus (E. Geoffroy Saint-Hilaire, 1803) is a sciurid commonly called the Neotropical pygmy squirrel. S. pusillus is an exceptionally small species of tree squirrel that appears pale gray due to a grizzled pattern of light hair tips on the dorsal pelage. Ranging from Amazonian Peru and Brazil northeast to the Guianas with a patchy distribution, S. pusillus is a denizen of the upper canopy of lowland rain forest. This species is listed as “Data Deficient” by the International Union for Conservation of Nature and Natural Resources.

We evaluated the occurrence of Sciurillus pusillus in Colombia and present the first confirmed records of the species in the country based on material deposited at Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Villa de Leyva (IAvH, former INDERENA). The mentioned material was collected in two localities from vicinities of town La Chorrera, Igara-Paraná River, Amazonas Department of Colombia. Additionally, we provide a description of the baculum from one of the specimens herein recorded from Colombia.

Sciurillus Thomas, 1914. Proc. Zool. Soc. Lond., 1914:416. TYPE SPECIES: Sciurus pusillus Desmarest, 1817. COMMENTS: Tribe Sciurillini (Moore, 1959)., Published as part of Robert S. Hoffmann & Charles G. Anderson, 1993, Order Rodentia - Family Sciuridae, pp. 419-465 in Mammal Species of the World (2 nd Edition), Washington and London :Smithsonian Institution Press on page 438, DOI: 10.5281/zenodo.7353130, {"references":["Moore, J. C. 1959. Relationships among the living squirrels of the Sciurinae. Bulletin of the American Museum of Natural History, 118 (4): 157 - 206."]}

Sciurillus pusillus (Desmarest, 1817). Nouv. Diet. Hist. Nat., 10: 109. TYPE LOCALITY: French Guiana, Cayenne. DISTRIBUTION: South America, north of the Amazon, and south of the Amazon in the Tapajoz river basin. ISIS NUMBER: 5301410002028001001., Published as part of James H. Honacki, Kenneth E. Kinman & James W. Koeppl, 1982, Order Rodentia (Part 1), pp. 345-382 in Mammal Species of the World (1 st Edition), Lawrence, Kansas, USA :Alien Press, Inc. & The Association of Systematics Collections on page 362, DOI: 10.5281/zenodo.7353023

Sciurillus Thomas, 1914. Proc. Zool. Soc. Lond., 1914:416. ISIS NUMBER: 5301410002028000000., Published as part of James H. Honacki, Kenneth E. Kinman & James W. Koeppl, 1982, Order Rodentia (Part 1), pp. 345-382 in Mammal Species of the World (1 st Edition), Lawrence, Kansas, USA :Alien Press, Inc. & The Association of Systematics Collections on page 362, DOI: 10.5281/zenodo.7353023