Sciurinae is a subfamily of squirrels, uniting the flying squirrels with certain related tree squirrels. Older sources place the flying squirrels in a separate subfamily (Pteromyinae) and unite all remaining sciurids into the subfamily Sciurinae, but this has been strongly refuted by genetic studies.
The Amazon dwarf squirrel is a chipmunk-sized tree squirrel native to South America.
Microsciurus or dwarf squirrels is a genus of squirrels from the tropical regions of Central and South America.
Callosciurus is a genus of squirrels collectively referred to as the "beautiful squirrels". They are found mainly in Southeast Asia, though a few species also occur in Nepal, northeastern India, Bangladesh and southern China. Several of the species have settled on islands. In total, the genus contains 15 species and numerous varieties and subspecies. The genera Glyphotes, Rubrisciurus, and Tamiops have sometimes been included in Callosciurus.
Sciurini is a tribe that includes about forty species of squirrels, mostly from the Americas. It includes five living genera—the American dwarf squirrels, Microsciurus; the Bornean Rheithrosciurus; the widespread American and Eurasian tree squirrels of the genus Sciurus, which includes some of the best known squirrel species; the Central American Syntheosciurus; and the American pine squirrels, Tamiasciurus. Like other arboreal squirrels, they are sometimes referred to as tree squirrels.
The Espíritu Santo antelope squirrel is a species of antelope squirrel in the family Sciuridae. It is endemic to Mexico, where it is known only from the island of Espíritu Santo in the Gulf of California. The species was originally described by Edward William Nelson and Edward Alphonso Goldman in 1909 as a subspecies of the white-tailed antelope squirrel, a wide-ranging species in the southwestern U.S. and Mexico. In 1938, Arthur H. Howell elevated the subspecies to full species status, on the basis of slightly larger skull proportions and the absence or reduction of the third upper premolar. Studies of DNA and chromosomes have variously suggested close relationships with Harris's antelope squirrels or other subspecies of white-tailed antelope squirrel. A 2007 comparison of DNA and morphological traits suggested the differences between Espíritu Santo squirrels and those on the Baja California peninsula and other islands were not enough to warrant distinct species but rather a subspecies of white-tailed antelope squirrels. Since 2008 the IUCN has similarly recognized the Espíritu Santo antelope squirrel as a subspecies of white-tailed antelope squirrel.
The grey-bellied squirrel is a species of rodent in the family Sciuridae. It is found in forests, plantations and gardens in Peninsular Malaysia, Thailand, southern Myanmar, southern China (Yunnan) and possibly western Laos. It has been introduced in the Ryukyu Islands in Japan. As suggested by its name, its belly is usually grey, though sometimes reddish on the sides. Depending on subspecies and season, the upperparts are grey, yellowish-olive or reddish.
The Mentawai squirrel is a species of rodent in the family Sciuridae. It is one of 20 or so species endemic to the Mentawai Islands off the west coast of Sumatra. There are three subspecies: C. m. melanogaster, C. m. mentawi, and C. m. atratus. This small isolated population is listed as "Vulnerable" by the IUCN due to habitat loss.
The Kashmir flying squirrel is a species of rodent in the family Sciuridae. It is monotypic within the genus Eoglaucomys. It is found in India and Pakistan. Its natural habitat is subtropical or tropical dry forests. It is threatened by habitat loss. The Afghan flying squirrel is usually considered a subspecies.
Epixerus ebii, also known as Ebian's palm squirrel, Temminck's giant squirrel, or the western palm squirrel, is a species of rodent in the family Sciuridae. It is the only species in the genus Epixerus, although eastern populations were previously regarded as a separate species, E. wilsoni. It is found in West and Central Africa. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.
The northern palm squirrel also called the five-striped palm squirrel is a species of rodent in the family Sciuridae. Some authorities recognize two subspecies, F. p. pennantii and F. p. argentescens. It is a semi-arboreal species found in tropical and subtropical dry deciduous forests and many other rural and urban habitats. It is a common species with a wide range and the International Union for Conservation of Nature has rated its conservation status as being of "least concern".
The Nilgiri striped squirrel is a threatened species of rodent, a small squirrel (Sciuridae) from rainforests in the southern Western Ghats, including the Nilgiris, in Peninsular India. It formerly included Funambulus obscurus from Sri Lanka as a subspecies, at which point the English name of the "combined species" also was dusky striped squirrel.
The Central American dwarf squirrel, also known as Alfaro's pygmy squirrel,(Microsciurus alfari) is a small tree squirrel in the genus Microsciurus and tribe Sciurini found in Colombia, Costa Rica, Nicaragua, and Panama. No species of squirrel within this genus are endangered, but they are rarely seen because they are shy and live hidden lives. This suggests that their population numbers may be larger than documented.
The Santander dwarf squirrel is a small tree squirrel endemic to Colombia.
The spotted giant flying squirrel, also known as the lesser giant flying squirrel, is a species of rodent in the family Sciuridae. It is found in hill and mountain forests at altitudes of 200–4,000 m (660–13,120 ft) in Southeast Asia north to central China and the east Himalayan region, although the northern populations sometimes are regarded as separate species as the grey-headed giant flying squirrel, Chindwin giant flying squirrel and P. marica. Two of these, as well as a few other populations, lack the white spots on the upperparts for which it is named. Although a large flying squirrel, it is a relatively small giant flying squirrel.
Allen's squirrel is a tree squirrel in the genus Sciurus endemic to northern Mexico. It has no recognised subspecies.
The red-tailed squirrel is a species of tree squirrel distributed from southern Central America to northern South America.
Peters's squirrel is a tree squirrel in the genus Sciurus endemic to Mexico. It was first described by the German naturalist and explorer Wilhelm Peters in 1863. Three subspecies are recognised. It is a common species, and the IUCN has rated its conservation status as being of "least concern".
Low's squirrel is a species of rodent in the family Sciuridae. It is found in Borneo and nearby islets. Its former subspecies S. l. robinsoni from Sumatra and Malay Peninsula and S. l. natunensis from the Natuna islands have recently been given species status
Humboldt's squirrel monkey is a species of squirrel monkey from Brazil, Colombia, Ecuador, Peru and Venezuela. It had previously been considered a subspecies of the common squirrel monkey, S. scuireus, but was elevated to full species status based on a genetic study by Carretero-Pinzón in 2009. A genetic study by Jessica Lynch Alfaro, et al indicated that the Ecuadorian squirrel monkey may be synonymous with Saimiri cassiquiarensis. As of 2018, the Ecuadorian squirrel monkey is generally regarded as a subspecies of Humboldt's squirrel monkey, S. cassiquiarensis macrodon.
