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Interdigital Webbing In Mammals
Interdigital webbing refers to the presence of skin membranes. Normally, in mammals, webbing is present but resorbed later in development, but in various mammal species, it occasionally persists in adulthood. In humans, it can be found in those suffering from LEOPARD syndrome and from Aarskog–Scott syndrome. Webbing between the digits of the hindfoot is also present in several mammals that semiaquatic, spend part of their time in the water.Voss, 1988, p. 455 Webbing accommodates movement in the water.Voss, 1988, p. 458 Interdigital webbing is not to be confused with syndactyly, which is a fusing of digits and occurs rarely in humans. Syndactyly specifically affecting feet occurs in birds (such as ducks), amphibians (such as frogs), and mammals (such as the kangaroo). Mammals with interdigital webbing Rodents In Oryzomyini, oryzomyines, a mainly South American rodent group, the marsh rice rat, ''Pseudoryzomys, Pseudoryzomys simplex'', and ''Sigmodontomys alfari'' all have sma ... [...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] |
Nectomys
''Nectomys'' is a genus of rodent in the tribe Oryzomyini of family Cricetidae. Musser and Carleton, 2005. It is closely related to '' Amphinectomys'' and was formerly considered congeneric with '' Sigmodontomys''. It consists of five species, which are allopatrically distributed across much of South America: '' Nectomys grandis'' in montane Colombia; '' Nectomys palmipes'' on Trinidad and in nearby Venezuela, '' Nectomys apicalis'' in the western margins of the Amazon biome, ''Nectomys rattus'' in much of Amazonia, and '' Nectomys squamipes'' in the Atlantic Forest of Brazil. These species are generally semiaquatic In biology, being semi-aquatic refers to various macroorganisms that live regularly in both aquatic and terrestrial environments. When referring to animals, the term describes those that actively spend part of their daily time in water (in ..., are normally found near water, and are commonly called water rats. Notes References Literature cited * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chimarrogale
The Asiatic water shrews are the members of the genus ''Chimarrogale''. They are mammals in the subfamily Soricinae of the family Soricidae. They are aquatic, with some species inhabiting streams. The genus contains the following species: * Malayan water shrew (''Chimarrogale hantu'') *Himalayan water shrew The Himalayan water shrew (''Chimarrogale himalayica'') is a species of mammal in the family Soricidae. It is found in China, India, Japan, Laos, Myanmar, Taiwan, and Vietnam Vietnam, officially the Socialist Republic of Vietnam (SRV), ... (''Chimarrogale himalayica'') * Bornean water shrew (''Chimarrogale phaeura'') * Japanese water shrew (''Chimarrogale platycephalus'') * Chinese water shrew (''Chimarrogale styani'') * Sumatran water shrew (''Chimarrogale sumatrana'') References Taxonomy articles created by Polbot {{redtoothed-shrew-stub ... [...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] |
Coypu
The nutria () or coypu () (''Myocastor coypus'') is a herbivore, herbivorous, semiaquatic rodent from South America. Classified for a long time as the only member of the family Myocastoridae, ''Myocastor'' has since been included within Echimyidae, the family of the spiny rats. The nutria lives in burrows alongside stretches of water and feeds on river plant stems. Originally native to subtropical and temperate South America, it was introduced to North America, Europe and Asia, primarily by fur farmers. Although it is still hunted and trapped for nutria fur, its fur in some regions, its destructive burrowing and feeding habits often bring it into conflict with humans, and it is considered an invasive species in the United States. Nutria also transmit various diseases to humans and animals, mainly through water contamination. Etymology The genus name ''Myocastor'' derives from the two Ancient Greek words () 'rat, mouse', and () 'beaver'. Therefore, the name ''Myocastor'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nilopegamys
The Ethiopian amphibious rat, also known as the Ethiopian water mouse (''Nilopegamys plumbeus''), is an insectivorous and semiaquatic species of rodent in the monotypic genus ''Nilopegamys'' of the family Muridae. There has only been one known specimen. It was found along the Lesser Abay River near its source at an altitude of 2600 m in the highlands of northwestern Ethiopia in 1928. ''N. plumbeus'' is considered to be the most aquatically adapted African murid; its unusually large brain is thought to be one consequence of this lifestyle. The species is considered to be critically endangered or possibly extinct, since its habitat has been severely damaged by overgrazing and monoculture. Distribution and discovery In late March 1928, the Ethiopian amphibious rat was cataloged for the first time. The specimen was discovered in a trap set by Wilfred H. Osgood, and was unlike any African rat he had seen before. The rat showed multiple adaptations to aquatic life which is uncommon f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colomys
The African wading rat or African water rat (''Colomys goslingi'') is a species of rodent in the family Muridae. It is native to Africa, where it occurs in Angola, Burundi, Cameroon, Republic of the Congo, Democratic Republic of the Congo, Equatorial Guinea, Ethiopia, Gabon, Kenya, Liberia, Rwanda, South Sudan, Uganda, and Zambia.Kerbis Peterhans, J., et al. 2008''Colomys goslingi''.The IUCN Red List of Threatened Species. Version 2014.3. Downloaded on 11 April 2015. An aquatic species, this rat is found in and around streams and pools in rainforest habitat, and sometimes in grassland and savanna regions. In 2020, a team of researchers from Siena College established that it is actually four separate species: the other three species have been named '' Colomys wologizi'', '' C. lumumbai'', and '' C. eisentrauti''. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Africa
Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surface area.Sayre, April Pulley (1999), ''Africa'', Twenty-First Century Books. . With nearly billion people as of , it accounts for about of the world's human population. Demographics of Africa, Africa's population is the youngest among all the continents; the median age in 2012 was 19.7, when the worldwide median age was 30.4. Based on 2024 projections, Africa's population will exceed 3.8 billion people by 2100. Africa is the least wealthy inhabited continent per capita and second-least wealthy by total wealth, ahead of Oceania. Scholars have attributed this to different factors including Geography of Africa, geography, Climate of Africa, climate, corruption, Scramble for Africa, colonialism, the Cold War, and neocolonialism. Despite this lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydromys
''Hydromys'' is a genus (biology), genus of semiaquatic rodents in the subfamily Murinae. Three species are endemism, endemic to New Guinea and nearby islands. The fourth species, the rakali, is also found on Australia. The most recently discovered member of this genus was described in 2005. List of species Genus ''Hydromys'' - water rats: *Rakali, ''Hydromys chrysogaster'' E. Geoffroy, 1804 *Western water rat, ''Hydromys hussoni'' Musser and Piik, 1982 *New Britain water rat, ''Hydromys neobritannicus'' Tate and Archbold, 1935 *Ziegler's water rat, ''Hydromys ziegleri'' Helgen, 2005 Note: ''Hydromys habbema'' Tate and Archbold, 1941 and ''Hydromys shawmayeri'' (Hinton, 1943) are placed within ''Baiyankamys'' after Helgen, 2005. References * External links * * {{Authority control Hydromys, Rodent genera Taxa named by Étienne Geoffroy Saint-Hilaire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baiyankamys
'' Baiyankamys'' is a genus of amphibious murid rodents. It was originally described, along with the species '' Baiyankamys shawmayeri'' by Hinton in 1943 after he found the remains of a single individual in south east of the Bismarck Mountain Range, north east New Guinea. Tate, in 1951 and, Laurie and Hill in 1954, confirmed the existence of both the species and genus. Classification Hinton described '' Baiyankamys'' as similar in appearance to the species '' Hydromys habbema'' but differed due to its unreduced pinnae and its lower teeth. It was described as having three lower molars on both sides of the lower jaw, whereas other genera of amphibious murines in New Guinea have only two. In 1968 Mahoney discovered that the specimen of ''B. shawmayeri'' was a composite resulting from an incorrectly associated mandible of the species '' Rattus niobe'' and the skull of a small water rat. When the correct mandible was found in the BMNH collections Mahoney proposed that, base ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Murinae
The Old World rats and mice, part of the subfamily Murinae in the family Muridae, comprise at least 519 species. Members of this subfamily are called murines. In terms of species richness, this subfamily is larger than all mammal families except the Cricetidae and Muridae, and is larger than all mammal orders except the bats and the remainder of the rodents. Description The Murinae are native to Africa, Europe, Asia, and Australia. They are terrestrial placental mammals. They have also been introduced to all continents except Antarctica, and are serious pest animals. This is particularly true in island communities where they have contributed to the endangerment and extinction of many native animals. Two prominent murine species have become vital laboratory animals: the brown rat and house mouse are both used as medical subjects. The murines have a distinctive molar pattern that involves three rows of cusps instead of two, the primitive pattern seen most frequently ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
