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Tenrec
A tenrec () is a mammal belonging to any species within the afrotherian family Tenrecidae, which is endemic to Madagascar. Tenrecs are a very diverse group, as a result of adaptive radiation, and exhibit convergent evolution, some resemble hedgehogs, shrews, opossums, rats, and mice. 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. However, the speciation rate in this group has been higher in humid forests. All tenrecs are believed to descend from a common ancestor that lived 29–37 million years ago after rafting over from Africa. The split from their closest relatives, African otter shrews, is estimated to have occurred about 47–53 million years ago. Etymology The word "tenrec" is borrowed, via French, from the Malagasy word (variant of ), which refers to the tailless tenrec (''Tenrec ecaudatus''); the Malagasy word may be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oryzorictinae
Oryzorictinae is a subfamily of tenrecs endemic to the island of Madagascar. It is the largest of three tenrec subfamilies. Oryzorictinae is thought to have split from the lineage of its closest relative, '' Geogale'', about 30 million years ( Ma) ago. The deepest phylogenetic split within the subfamily, that between '' Oryzorictes'' and a clade composed of ''Microgale'' plus ''Nesogale'', is thought to have occurred about 28 Ma ago. In turn, ''Microgale'' and ''Nesogale'' are thought to have diverged about 19 Ma ago. Species Subfamily Oryzorictinae * Genus '' Microgale'' ** Short-tailed shrew tenrec (''M. brevicaudata'') ** Cowan's shrew tenrec (''M. cowani'') ** Drouhard's shrew tenrec (''M. drouhardi'') ** Dryad shrew tenrec (''M. dryas'') ** Pale shrew tenrec (''M. fotsifotsy'') ** Gracile shrew tenrec (''M. gracilis'') ** Grandidier's shrew tenrec (''M. grandidieri'') **Naked-nosed shrew tenrec (''M. gymnorhyncha'') ** Jenkins's shrew tenrec (''M. jenkinsae'') ** Northern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tailless Tenrec
The tailless tenrec (''Tenrec ecaudatus''), also known as the common tenrec, is a species of mammal in the family Tenrecidae. It is the only member of the genus ''Tenrec''. Native to Madagascar, it is also found on the Comoros, Mauritius, Réunion, and Seychelles island groups, where it has been purposely introduced. Its natural habitat is the understory of subtropical-tropical forest, open forest, arid shrub-land, savanna, arable land, pastures, crop plantations, private gardens, and some landscaped, urban areas. The tailless tenrec is the largest species of the tenrec family, Tenrecidae. It is in length and weighs up to . It has medium-sized, coarse grey to reddish-grey fur and long, sharp spines along its body. The animal is omnivorous, and unlike the herbivorous rodents for which it is often mistaken, possesses small, needle-like sharp teeth for a diet of larger invertebrates, frogs, reptiles, mice, and other small mammals, as well as fruits, leaves, and other vegetation. I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tenrecinae
Tenrecinae is a Tenrecidae, tenrec subfamily endemic to the island of Madagascar. It contains the largest species in the family, ''Tenrec ecaudatus''. All members of the genus possess Spine (zoology), spines, analogous to those of hedgehogs, for defense against predators. Tenrecinae is thought to have split from the lineages of all other extant tenrecs about 36 million years (Megaannum, Ma) ago. The deepest phylogenetic split within the subfamily, that between two clades composed of ''Echinops'' plus ''Setifer'' and ''Hemicentetes'' plus ''Tenrec'', is thought to have occurred about 26 Ma ago. In turn, ''Hemicentetes'' is thought to have diverged from ''Tenrec'' about 16 Ma ago, and ''Echinops'' from ''Setifer'' about 10 Ma ago. Extant species Subfamily Tenrecinae * Tribe: Setiferini ** Genus ''Lesser hedgehog tenrec, Echinops'' *** Lesser hedgehog tenrec (''E. telfairi'') ** Genus ''Setifer'' *** Greater hedgehog tenrec (''S. setosus'') * Tribe: Tenrecini ** Genus ''Hemicent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greater Hedgehog Tenrec
The greater hedgehog tenrec (''Setifer setosus''), also known as the large Madagascar hedgehog or sokina, is a species of mammal in the family Tenrecidae. It is endemic to Madagascar. Its natural habitats are subtropical or tropical forests, shrubland and grassland, savanna, rural gardens, and urban areas. It is the only species in the genus ''Setifer''. Despite the close resemblance, it is not closely related to hedgehogs. Similarly to hedgehogs, neoplasia is common within the species and plays a significant role in morbidity and mortality. Distribution and habitat Greater hedgehog tenrecs are found throughout the island of Madagascar and are endemic to this island. The island of Madagascar ranges from sea level to 2,250 meters above sea level, and Setifer setosus is found throughout the island, with the exception of wetlands and marshes. Greater hedgehog tenrecs are seen in urban areas and even in areas with extensive human disturbance. The prime habitat for greater hedgeh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afrotheria
Afrotheria ( from Latin ''Afro-'' "of Africa" + ''theria'' "wild beast") is a superorder of placental mammals, the living members of which belong to groups that are either currently living in Africa or of African origin: golden moles, elephant shrews (also known as sengis), otter shrews, tenrecs, aardvarks, hyraxes, elephants, sea cows, and several extinct clades. Most groups of afrotheres share little or no superficial resemblance, and their similarities have only become known in recent times due to genetics and molecular studies. Many afrothere groups are found mostly or exclusively in Africa, reflecting the fact that Africa was an island continent from the Cretaceous until the early Miocene around 20 million years ago, when Afro-Arabia collided with Eurasia. Because Africa was isolated by water, Laurasian groups of mammals such as insectivores, rodents, lagomorphs, carnivorans and ungulates could not reach Africa for much of the early to mid-Cenozoic. Instead, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otter Shrew
Potamogalidae is the family of "otter shrews", a group of semiaquatic riverine afrotherian mammals indigenous to sub-Saharan Africa. They are most closely related to the tenrecs of Madagascar, from which they are thought to have split about 47–53 million years ago. They were formerly considered a subfamily of Tenrecidae. All otter shrews are carnivorous, preying on any aquatic animal they can find with their sensitive whiskers, particularly insects. As their common name suggests, they bear a strong, but superficial resemblance to true otters to which they are not closely related, nor are they closely related to true shrews. They move through the water by undulating their tail in a side-to-side motion similar to the motions made by a crocodile swimming. Morphology Otter shrews have small eyes and ears, consistent with the features of nearly all shrews. They have a broad, flat, muzzle that is substantially covered with sensitive whiskers and ends in a leathery pad. The margin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porcupine
Porcupines are large rodents with coats of sharp Spine (zoology), spines, or quills, that protect them against predation. The term covers two Family (biology), families of animals: the Old World porcupines of the family Hystricidae, and the New World porcupines of the family Erethizontidae. Both families belong to the infraorder Hystricognathi within the profoundly diverse order (biology), order Rodentia and display superficially similar coats of rigid or semi-rigid quills, which are modified hairs composed of keratin. Despite this, the two groups are distinct from one another and are not closely related to each other within the Hystricognathi. The largest species of porcupine is the third-largest living rodent in the world, after the capybara and beaver. The Old World porcupines (Hystricidae) live in Italy, Asia (western and southern), and most of Africa. They are large, terrestrial, and strictly nocturnal. The New World porcupines (Erethizontidae) are indigenous to North Amer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hedgehog
A hedgehog is a spiny mammal of the subfamily Erinaceinae, in the eulipotyphlan family Erinaceidae. There are 17 species of hedgehog in five genera found throughout parts of Europe, Asia, and Africa, and in New Zealand by introduction. There are no hedgehogs native to Australia and no living species native to the Americas. However, the extinct genus '' Amphechinus'' was once present in North America. Hedgehogs share distant ancestry with shrews (family Soricidae), with gymnures possibly being the intermediate link, and they have changed little over the last 15 million years. Like many of the first mammals, they have adapted to a nocturnal way of life. Their spiny protection resembles that of porcupines, which are rodents, and echidnas, a type of monotreme. Etymology The name ''hedgehog'' came into use around the year 1450, derived from the Middle English , from , , because it frequents hedgerows, and , , from its piglike snout. Other names that are used are ''urchin' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shrew
Shrews ( family Soricidae) are small mole-like mammals classified in the order Eulipotyphla. True shrews are not to be confused with treeshrews, otter shrews, elephant shrews, West Indies shrews, or marsupial shrews, which belong to different families or orders. Although its external appearance is generally that of a long-nosed mouse, a shrew is not a rodent, as mice are. It is, in fact, a much closer relative of hedgehogs and moles; shrews are related to rodents only in that both belong to the Boreoeutheria magnorder. Shrews have sharp, spike-like teeth, whereas rodents have gnawing front incisor teeth. Shrews are distributed almost worldwide. Among the major tropical and temperate land masses, only New Guinea, Australia, New Zealand, and South America have no native shrews. However, as a result of the Great American Interchange, South America does have a relatively recently naturalised population, present only in the northern Andes. The shrew family has 385 kn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammal
A mammal () is a vertebrate animal of the Class (biology), class Mammalia (). Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three Evolution of mammalian auditory ossicles, middle ear bones. These characteristics distinguish them from reptiles and birds, from which their ancestors Genetic divergence, diverged in the Carboniferous Period over 300 million years ago. Around 6,640 Neontology#Extant taxon, extant species of mammals have been described and divided into 27 Order (biology), orders. The study of mammals is called mammalogy. The largest orders of mammals, by number of species, are the rodents, bats, and eulipotyphlans (including hedgehogs, Mole (animal), moles and shrews). The next three are the primates (including humans, monkeys and lemurs), the Artiodactyl, even-toed ungulates (including pigs, camels, and whales), and the Carnivora (including Felidae, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oceanic Dispersal
Oceanic dispersal is a type of biological dispersal that occurs when Terrestrial animal, terrestrial organisms transfer from one land mass to another by way of a sea crossing. Island hopping is the crossing of an ocean by a series of shorter journeys between islands, as opposed to a single journey directly to the destination. Often this occurs via large rafts of floating vegetation such as are sometimes seen floating down major rivers in the tropics and washing out to sea, occasionally with animals trapped on them. Dispersal via such a raft is sometimes referred to as a rafting event. Colonization of land masses by plants can also occur via long-distance oceanic dispersal of floating seeds. History Rafting has played an important role in the colonization of isolated land masses by mammals. Prominent examples include Madagascar, which has been isolated for ~120 million years (Year#SI prefix multipliers, Ma), and South America, which was isolated for much of the Cenozoic. Both lan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
