Callosciurus prevostii 149C. p. raffl esii—southern Sumatra. This form is black on the
back, and chestnut ventrally and on the forelimb and
shoulder. It has a white lateral stripe extending from the
shoulder and broadening posteriorly to the thigh. The
cheeks are grizzled gray, with a white spot on the sides of
the nose.
On the island of Borneo, eight subspecies have been recog-
nized, all with dark red to orange underparts. Three other
subspecies occur on small islands just off the Bornean coast.
C. p. atricapillus—eastern West Kalimantan, south of the Ra-
jang River, and northern Central Kalimantan (Indone-
sia). This form has an olive buff dorsum, with a black
head and rump.
C. p. atrox—West Kalimantan. This form has a black tail,
with the rest of the dorsum grizzled olive buff.
C. p. borneoensis—southwestern Sarawak (Malaysia) and ad-
joining West Kalimantan (Indonesia). This form has a
black dorsum, with the shoulders tinged with red. The
thighs are gray, and both the thighs and the tail are griz-
zled. It has a distinct white side stripe.
C. p. caedis—Banggi and Balembangan islands (Malaysia,
slightly north of the island of Borneo). This subspecies is
all black on the back, without a lateral white stripe. It is
similar to but geographically disjunct from C. p. pluto and
C. p. rufonigra.
C. p. coomansi—an island in the Kapuas River delta (Indone-
sia). This form has a black dorsum, with the shoulders
tinged bright rufus. The thighs are gray, and both the
thighs and the tail are grizzled. It also has a distinct
white side stripe.
C. p. palustris—just north of the Kapuas River (Indonesia).
This subspecies resembles C. p. borneoensis, but it lacks
the reddish tinge on the shoulders.
C. p. pluto—Sabah (Malaysia). This form is all black on the
back, without a lateral white stripe. It is similar to but geo-
graphically disjunct from C. p. caedis and C. p. rufonigra.
C. p. rufonigra—Labuan Island (Malaysia). This form is all
black on the back, without a lateral white stripe. It is
similar to but geographically disjunct from C. p. caedis
and C. p. pluto.
C. p. sanggaus—West Kalimantan, south of the Kapuas River
(Indonesia). This form resembles C. p. borneoensis, but with
paler shoulders and a completely black tail.
C. p. sarawakensis—Sarawak (Malaysia). This form’s entire
dorsum is grizzled gray, usually with a reddish tinge
anteriorly.
C. p. waringensis—Central Kalimantan (Indonesia). This sub-
species resembles C. p. sanggaus, but with paler thighs
and less reddish shoulders.There are also 15 smaller islands with named populations
on them.conservation: IUCN status—least concern. Population
trend—decreasing.habitat: C. prevostii occurs in tall and secondary forests.
On the island of Borneo, it is widespread in the lowlands
and hills, with the highest elevation records being slightly
more than 1200 m. It will enter gardens and plantations in
order to feed on fruits.Callosciurus prevostii pluto. Photo courtesy A. Coke Smith,
http://www.cokesmithphototravel.com.