Tenrec

Tenrecidae
Temporal range: Bartonian–Recent
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Tanrek.jpg
Tenrec ecaudatus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Afrosoricida
Suborder: Tenrecomorpha
Butler, 1972
Family: Tenrecidae
Gray, 1821
Subfamilies
A tenrec in defensive mode, Horniman Museum and Gardens, London

A tenrec is any species of mammal within the family Tenrecidae, found on Madagascar and in parts of the African mainland. [2] Tenrecs are widely diverse; as a result of convergent evolution they resemble hedgehogs, shrews, opossums, mice and even otters. They occupy aquatic, arboreal, terrestrial and fossorial environments. Some of these species, including the greater hedgehog tenrec, can be found in the Madagascar dry deciduous forests.

Characteristics

Tenrecs are small mammals of variable body form. The smallest species are the size of shrews, with a body length of around 4.5 cm (1.8 in), and weighing just 5 g (0.18 oz), while the largest, the common or tailless tenrec, is 25 to 39 cm (9.8 to 15.4 in) in length, and can weigh over 1 kilogram (2.2 lb). [3] Although they may resemble shrews, hedgehogs, or otters, they are not closely related to any of these groups, their closest relatives being other African insectivorous mammals, such as golden moles and elephant shrews. The common ancestry of these animals, along with aardvarks, hyraxes, elephants, and sea cows in the group Afrotheria, was not recognized until the late 1990s. [4] Continuing work on the molecular [5] [6] and morphological [7] [8] [9] [10] diversity of afrotherian mammals has provided ever increasing support for their common ancestry.

Unusual among placental mammals, the anus and urogenital tracts of tenrecs share a common opening, or cloaca, a feature more commonly seen in birds, reptiles, and amphibians. They have a low body temperature, sufficiently so that they do not require a scrotum to cool their sperm as do most other mammals. [3]

All species appear to be at least somewhat omnivorous, with invertebrates forming the largest part of their diets. The three species found on the African mainland (Potamogale velox, Micropotamogale lamottei, M. ruwenzorii) have more specialized diets, centered on their habitat in fast-running streams of the African tropics, from Liberia in the west to Lake Victoria in the east. One species from Madagascar, Limnogale mergulus, is also semiaquatic. [11] All of the species from Madagascar, semiaquatic or not, appear to have evolved from a single, common ancestor, with the mainland tenrecs comprising the next, most-closely related mammalian species. [12] [13] While the fossil record of tenrecs is scarce, at least some specimens from the early Miocene of Kenya show close affinities to living species from Madagascar, [14] such as Geogale aurita.

Most species are nocturnal and have poor eyesight. Their other senses are well developed, however, and they have especially sensitive whiskers. As with many of their other features, the dental formula of tenrecs varies greatly between species; they can have from 32 to 42 teeth in total. Unusual for mammals, the permanent dentition in tenrecs tends not to completely erupt until well after adult body size has been reached. [15] This is one of several anatomical features shared by elephants, hyraxes, sengis, and golden moles (but apparently not aardvarks), consistent with their descent from a common ancestor.

Tenrecs have a gestation period of 50 to 64 days, and give birth to a number of relatively undeveloped young. While the otter shrews have just two young per litter, the tailless tenrec can have as many as 32, and females possess up to 29 teats, more than any other mammal. [3] At least some tenrec species are social, living in multigenerational family groups with over a dozen individuals.

Other Languages
беларуская: Тэнрэкавыя
български: Тенреци
brezhoneg: Tenrek
català: Tenrec
Cebuano: Tenrecidae
čeština: Bodlínovití
Deutsch: Tenreks
español: Tenrecidae
euskara: Tenrecidae
فارسی: تیغ‌پشت
français: Tenrecidae
galego: Tenrécidos
한국어: 텐렉과
Հայերեն: Տենրեկներ
italiano: Tenrecidae
עברית: טנרקיים
Kiswahili: Tandaraka
latviešu: Tenreku dzimta
lietuvių: Tenrekiniai
Limburgs: Tenreks
Nederlands: Tenreks
occitan: Tenrecidae
polski: Tenrekowate
português: Tenrecidae
русский: Тенрековые
Scots: Tenrec
Simple English: Tenrec
suomi: Tanrekit
svenska: Tanrekar
Türkçe: Tenrekgiller
українська: Тенрекові
Tiếng Việt: Tenrecidae
Winaray: Tenrecidae
中文: 马岛猬科