The Info List - Sciurillinae

The Neotropical pygmy squirrel
Neotropical pygmy squirrel
(Sciurillus pusillus) is a South American species of tree squirrel, being the only living species in the genus Sciurillus and the subfamily Sciurillinae. Genetic analysis has shown it to be the sister group to all other squirrels.[2]


1 Description 2 Distribution and habitat 3 Biology and behaviour 4 References 5 Further reading

Description[edit] The Neotropical pygmy squirrel
Neotropical pygmy squirrel
is the smallest species of tree squirrel native to the Americas, measuring on average just 10 cm (3.9 in) in head-body length, with an 11-cm tail. Adults weigh from 30 to 48 grams (1.1 to 1.7 oz). The fur is grizzled grey over the body, with paler, but not sharply contrasting, fur on the underparts. The head is slightly reddish, with distinct white markings behind the ears, which are shorter and more rounded than on most other tree squirrels. The limbs are slender, with the fore limbs elongated to assist in climbing. Females have six teats.[3] Distribution and habitat[edit] Neotropical pygmy squirrels inhabit at least four widely separated regions in northern South America, in French Guiana, Surinam, central Brazil, northern Peru, and southern Colombia.[1] Within these regions, they inhabit lowland tropical rainforests.[3] Three subspecies are currently recognised,[4] although their respective geographic distributions are unclear, and these may represent two or more distinct species.[2]

S. p. pusillus (E. Geoffroy, 1803) S. p. glaucinus Thomas, 1914 S. p. kuhlii (Gray, 1867)

Biology and behaviour[edit] Neotropical pygmy squirrels are diurnal and spend the day in the forest canopy, usually at least 9 m (30 ft) above the ground.[5] They have been observed nesting in abandoned arboreal termite nests lined with fibres gathered from the machimango (Eschweilera) tree.[3] They feed by gnawing on the bark of trees, especially those of the genus Parkia, and probably eating either the gummy exudates produced by the trees in response to injury or the cambium beneath the bark.[5] Population densities are apparently low, with normally no more than three individual per km2,[6] although groups containing more than one adult, plus young, have been observed in areas with a local concentration of food.[3] These squirrels typically move rapidly through the trees, and are highly excitable, giving an alarm call described as similar to the sound of a cricket. They give birth to one or two young at a time, with pregnant females having been observed in June.[3] References[edit]

^ a b Amori, G.; Koprowski, J. & Roth, L. (2008). "Sciurillus pusillus". The IUCN Red List
IUCN Red List
of Threatened Species. IUCN. 2008: e.T19997A9130129. doi:10.2305/IUCN.UK.2008.RLTS.T19997A9130129.en. Retrieved 12 January 2018.  ^ a b Mercer, J.M. & Roth, V.L. (2003). "The effects of Cenozoic global change on squirrel phylogeny". Science. 299 (5612): 1568–1572. doi:10.1126/science.1079705. PMID 12595609.  ^ a b c d e Jessen, R.R.; et al. (2013). " Sciurillus pusillus (Rodentia: Sciuridae)". Mammalian Species. 45 (903): 75–79. doi:10.1644/903.1.  ^ Thorington, R.W., Jr.; Hoffmann, R.S. (2005). "Family Sciuridae: Sciurillus pusillus". In Wilson, D.E.; Reeder, D.M. Mammal
Species of the World: a taxonomic and geographic reference (3rd ed.). The Johns Hopkins University Press. pp. 754–818. ISBN 0-8018-8221-4. OCLC 26158608.  ^ a b Heymann, E.W. & Knogge, C. (1997). "Field observations on Neotropical pygmy squirrel, Sciurillus pusillus (Rodentia: Sciuridae) in Peruvian Amazon" (PDF). Ecotropica. 3 (1): 67–69.  ^ de Thoisy, B.; et al. (2008). "Assessment of large-vertebrate species richness and relative abundance in Neotropical forest using line-transect censuses: what is the minimal effort required?". Biodiversity and Conservation. 17 (11): 2627–2644. doi:10.1007/s10531-008-9337-0. 

Further reading[edit]

John F Eisenberg and Kent H Redford, 2000. Mammals of the Neotropics: Ecuador, Bolivia, Brazil

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Extant species of family Sciuridae (subfamilies Ratufinae and Sciurillinae)

Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Rodentia Suborder: Sciuromorpha

Ratufinae (Oriental giant squirrels)


Cream-coloured giant squirrel
Cream-coloured giant squirrel
(Ratufa affinis) Black giant squirrel
Black giant squirrel
(Ratufa bicolor) Indian giant squirrel
Indian giant squirrel
(Ratufa indica) Grizzled giant squirrel
Grizzled giant squirrel
(Ratufa macroura)



Neotropical pygmy squirrel
Neotropical pygmy squirrel
(Sciurillus pusillus)


Taxon identifiers

Wd: Q694473 ADW: Sciurillus BioLib: 35054 EoL: 326304 GBIF: 2437421 ITIS: 632417 IUCN: 19997 MSW: 12400036