tree shrew


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tree shrew,

small, arboreal mammalmammal,
an animal of the highest class of vertebrates, the Mammalia. The female has mammary glands, which secrete milk for the nourishment of the young after birth. In the majority of mammals the body is partially or wholly covered with hair; the heart has four chambers, and
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 of the family Tupaiidae, found in S Asia. The 17 known species of tree shrews are classified as the order Tupaioidea or Scandentia. Tree shrews superficially resemble squirrels, and are commonly brown, gray, or olive in color. They have large eyes, good vision, and can use their clawed forepaws effectively for holding food. Tree shrews are territorial, omnivorous, and extremely active; they dart about constantly in the trees screaming and fighting with one another. The common tree shrew, Tupais glis, looks like a squirrel with an elongated, shrewlike snout. Its body is about 8 in. (20 cm) long, and it has a bushy tail about 6 in. (15 cm) long. It is found from India to Malaysia. The pen-tailed tree shrew, Ptilocercus lowi, of Sumatra, Borneo, and the Malay Peninsula is the most distinctive tree shrew; it is a mouse-sized nocturnal animal, dark gray above and yellow below, with a naked, black tail bearing two fringes of white hair at the tip. Tree shrews bear some anatomical resemblance to both the true shrewshrew,
common name for the small, insectivorous mammals of the family Soricidae, related to the moles. Shrews include the smallest mammals; the smallest shrews are under 2 in. (5.1 cm) long, excluding the tail, and the largest are about 6 in. (15 cm) long.
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, which is an insectivoreinsectivore
, term broadly given to any insect-eating animal or plant. The term also refers to mammals of the former order Insectivora, in which was included the shrew, mole, hedgehog, tenrec, and solenodon.
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, and to the lemurlemur
, name for prosimians, or lower primates, of two related families, found only on Madagascar and adjacent islands. Lemurs have monkeylike bodies and limbs, and most have bushy tails about as long as the body. They have pointed muzzles and large eyes.
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, which is a primateprimate,
member of the mammalian order Primates, which includes humans, apes, monkeys, and prosimians, or lower primates. The group can be traced to the late Cretaceous period, where members were forest dwellers.
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. Tree shrews are now seen as a possible model for early primate behavior. They are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Mammalia, order Scandentia, family Tupaiidae.

Bibliography

See R. D. Martin, Primate Origins and Evolution (1990).

References in periodicals archive ?
Therefore, researchers concluded that feeding adaptation to Piper Boehmeria folium is the most likely explanation for the fixation of this mutation by positive selection, thus allowing the tree shrew's diet to expand.
If the tree shrew can be demonstrated to be a good AD model, it would provide numerous advantages over primate and rodent models.
McBrien, "Retinal and choroidal TGF-[beta] in the tree shrew model of myopia: isoform expression, activation and effects on function," Experimental Eye Research, vol.
Cao et al., "Genome of the Chinese tree shrew," Nature Communications, vol.
Casagrande, 'Myopia in the lid-sutured tree shrew (Tupaia glis)', Brain Research, vol.
It should be noted that the PLAC1 protein of the tree shrew, taken here to be the species most like the common ancestor of all Placentalia, is 211 amino acids long.
This likely reflects the derivation of nails from an ancestor with claws (something like a tree shrew).
AB303301) showed that RV1 was homologous to tree shrew adenovirus 1 (70.0% amino acid sequence identity), porcine adenovirus 5 (69.2%), canine adenovirus 1 (68.9%), human adenoviruses-3, -16, -21 and -50 (68.9%), and other viruses (>64.8%) in genus Mastadenovirus, but less homologous (46.7%-57.8%) to viruses in other genuses, Siadenovi rus, Aviadenovirus, and Atadenovirus.
The fossilised skeleton of Repenomamos giganticus, compared with the skeleton of a tree shrew
On this stand I saw a smoky quartz carving o f a Chinese cabbage leaf with a tree shrew sitting on top.
According to a report by BBC News, the researchers found that the plant has a pitcher the exact same size as a tree shrew's body.
LARGE TREE SHREW: Despite its name, this mammal is not a shrew and lives mostly on the ground.