Sundasciurus Robinsoni
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''Sundasciurus robinsoni'', or Robinson's squirrel, is a species of
rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are na ...
in the family
Sciuridae Squirrels are members of the family Sciuridae, a family that includes small or medium-size rodents. The squirrel family includes tree squirrels, ground squirrels (including chipmunks and prairie dogs, among others), and flying squirrels. Squ ...
. It is found in
Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...
,
Malaysia Malaysia ( ; ) is a country in Southeast Asia. The federation, federal constitutional monarchy consists of States and federal territories of Malaysia, thirteen states and three federal territories, separated by the South China Sea into two r ...
and
Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is bo ...
. The species ''Sundasciurus robinsoni'' has a dorsum that ranges from medium brown with orange
agouti The agouti (, ) or common agouti is any of several rodent species of the genus ''Dasyprocta''. They are native to Middle America, northern and central South America, and the southern Lesser Antilles. Some species have also been introduced else ...
to dark brown (''S. r. vanakeni''), and its venter ranges from white to pale yellow/buff white, with a reduction in the extent of this pale coloration and a lack of distinct margins in the case of ''S. r. vanakeni''. Some populations (''S. r. balae'' and ''S. r. vanakeni'') have a grayish ventral coloration in limbs while others do not (''S. r. robinsoni''). It can be easily distinguished from other medium-sized western
Sundaland Sundaland (also called Sundaica or the Sundaic region) is a biogeographical region of South-eastern Asia corresponding to a larger landmass that was exposed throughout the last 2.6 million years during periods when sea levels were lower. It ...
''
Sundasciurus ''Sundasciurus'' is a genus of rodent in the family Sciuridae. It contains 20 species: *Genus ''Sundasciurus'' ** Sumatran mountain squirrel (''Sundasciurus altitudinis'') ** Brooke's squirrel (''Sundasciurus brookei'') ** Bornean mountain grou ...
'' based on its ventral coloration and tail. All populations of '' S. fraterculus'' except
Siberut Siberut is the largest and northernmost of the Mentawai Islands, located 150 kilometres west of Sumatra in the Indian Ocean. It covers an area of 3,838.25 km2 including smaller offshore islands, and had a population of 35,091 at the 2010 Cens ...
, '' S. tahan'', and '' S. altitudinis'' have a venter fur coloration homogeneously admixed with gray. The only other medium sized squirrel found in syntopy, '' S. tenuis'', is also usually ventrally darker ( admixed with gray) and dorsally lighter, with reddish-brown coloration on the shoulders and hips, white/pallid yellow hair tips present on tail, and a relatively thinner and longer tail (85–95% of head-body length; than ''S. robinsoni'' (56–84% of head-body length). Males of ''S. fraterculus'', ''S. tahan'' and ''S. tenuis'' have a darker orange wash in the scrotal area than ''S. robinsoni'', which is peach colored.


References


External links

* - Entry on MammalDiversity.org {{Taxonbar, from=Q98034216 Sundasciurus Rodents of Indonesia Rodents of Malaysia Rodents of Thailand Mammals described in 1902