|
Ictidomys
''Ictidomys'' is a North American genus of rodent in the squirrel family, which contains the thirteen-lined ground squirrel, the Mexican ground squirrel, and the Rio Grande ground squirrel. These species were included in the species-rich ground squirrel genus ''Spermophilus'' until molecular data showed that this genus was not a natural, monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ... grouping. References * * Rodent genera Taxa named by Joel Asaph Allen {{ground-squirrel-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidomys Tridecemlineatus
The thirteen-lined ground squirrel (''Ictidomys tridecemlineatus''), also known as the striped gopher, leopard ground squirrel, squinney, (formerly known as the leopard-spermophile in the age of John James Audubon, Audubon), is a ground squirrel that is widely distributed over grasslands and prairies of North America. Description It is brownish, with 13 alternating brown and whitish longitudinal lines (sometimes partially broken into spots) on its back and sides, creating rows of whitish spots within dark lines. Taxonomy This species has usually been placed in the genus ''Spermophilus'' with about 40 other species. As this large genus is paraphyly, paraphyletic to prairie dogs, marmots, and antelope squirrels, Kristofer Helgen and colleagues have split it into eight genera, placing the thirteen-lined ground squirrel in ''Ictidomys'' with two other species. Behavior The thirteen-lined ground squirrel is strictly Diurnal animal, diurnal and is especially active on warm da ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thirteen-lined Ground Squirrel
The thirteen-lined ground squirrel (''Ictidomys tridecemlineatus''), also known as the striped gopher, leopard ground squirrel, squinney, (formerly known as the leopard-spermophile in the age of Audubon), is a ground squirrel that is widely distributed over grasslands and prairies of North America. Description It is brownish, with 13 alternating brown and whitish longitudinal lines (sometimes partially broken into spots) on its back and sides, creating rows of whitish spots within dark lines. Taxonomy This species has usually been placed in the genus ''Spermophilus'' with about 40 other species. As this large genus is paraphyletic to prairie dogs, marmots, and antelope squirrels, Kristofer Helgen and colleagues have split it into eight genera, placing the thirteen-lined ground squirrel in ''Ictidomys'' with two other species. Behavior The thirteen-lined ground squirrel is strictly diurnal and is especially active on warm days. A solitary or only somewhat colonial hiber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidomys
''Ictidomys'' is a North American genus of rodent in the squirrel family, which contains the thirteen-lined ground squirrel, the Mexican ground squirrel, and the Rio Grande ground squirrel. These species were included in the species-rich ground squirrel genus ''Spermophilus'' until molecular data showed that this genus was not a natural, monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ... grouping. References * * Rodent genera Taxa named by Joel Asaph Allen {{ground-squirrel-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidomys Parvidens
The Rio Grande ground squirrel (''Ictidomys parvidens'') is a species of squirrel in the family Sciuridae. It is found in the south-western United States (Texas and New Mexico) and in north-eastern Mexico. Taxonomy and systematics The Rio Grande ground squirrel was formerly considered to be a subspecies of the Mexican ground squirrel and, along with the other species of the genus ''Ictidomys'', was classified in the much larger genus ''Spermophilus ''Spermophilus'' is a genus of ground squirrels in the Sciuridae, squirrel family. As traditionally defined the genus was very species-rich, ranging through Europe, Asia and North America, but this arrangement was found to be paraphyletic to ...'', until DNA sequencing of the cytochrome ''b'' gene showed that this group was paraphyletic to the prairie dogs and marmots, and could therefore no longer be retained as a single genus. As a result, ''Ictidomys'' is now considered as a genus in its own right. References Ictidomys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rio Grande Ground Squirrel
The Rio Grande ground squirrel (''Ictidomys parvidens'') is a species of squirrel in the family Sciuridae Squirrels are members of the family Sciuridae, a family that includes small or medium-size rodents. The squirrel family includes tree squirrels, ground squirrels (including chipmunks and prairie dogs, among others), and flying squirrels. Squ .... It is found in the south-western United States (Texas and New Mexico) and in north-eastern Mexico. Taxonomy and systematics The Rio Grande ground squirrel was formerly considered to be a subspecies of the Mexican ground squirrel and, along with the other species of the genus ''Ictidomys'', was classified in the much larger genus ''Spermophilus'', until DNA sequencing of the cytochrome ''b'' gene showed that this group was paraphyletic to the prairie dogs and marmots, and could therefore no longer be retained as a single genus. As a result, ''Ictidomys'' is now considered as a genus in its own right. References Ictidom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mexican Ground Squirrel
The Mexican ground squirrel (''Ictidomys mexicanus'') is a species of rodent in the family Sciuridae. It is found in Mexico and the United States. One of its closest relatives is the thirteen-lined ground squirrel (''Ictidomys tridecemlineatus''). Description The Mexican ground squirrel is a small to medium-sized rodent with nine rows of white spots on its back. It is about fifteen inches in length and the males are larger than the females. It also has small white circles of fur around its eyes and small ears. Distribution and habitat The Mexican ground squirrel is found in northern Mexico, the Texas Gulf Coast, western and central Texas, and southeastern New Mexico. The Mexican ground squirrel lives in flat, brushy, or grassy areas and usually prefers areas with gravelly or sandy soil or areas with that have mesquite. While much of its original habitat has been destroyed by humans, it has adapted well to human civilization and can now be found on golf courses and other grassy a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ictidomys Mexicanus
The Mexican ground squirrel (''Ictidomys mexicanus'') is a species of rodent in the family Sciuridae. It is found in Mexico and the United States. One of its closest relatives is the thirteen-lined ground squirrel (''Ictidomys tridecemlineatus''). Description The Mexican ground squirrel is a small to medium-sized rodent with nine rows of white spots on its back. It is about fifteen inches in length and the males are larger than the females. It also has small white circles of fur around its eyes and small ears. Distribution and habitat The Mexican ground squirrel is found in northern Mexico, the Texas Gulf Coast, western and central Texas, and southeastern New Mexico. The Mexican ground squirrel lives in flat, brushy, or grassy areas and usually prefers areas with gravelly or sandy soil or areas with that have mesquite. While much of its original habitat has been destroyed by humans, it has adapted well to human civilization and can now be found on golf courses and other grassy a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spermophilus
''Spermophilus'' is a genus of ground squirrels in the Sciuridae, squirrel family. As traditionally defined the genus was very species-rich, ranging through Europe, Asia and North America, but this arrangement was found to be paraphyletic to the certainly distinct prairie dogs, marmots, and antelope squirrels. As a consequence, all the former ''Spermophilus'' species of North America have been moved to other genera, leaving the European and Asian species as true ''Spermophilus'' (the only exceptions are two Asian ''Urocitellus''). Some species are sometimes called susliks (or sousliks). This name comes from Russian :ru:Суслики, суслик, ''suslik''. In some languages, a derivative of the name is in common usage, for example ''suseł'' in Polish. The scientific name of this genus means "seed-lovers" (gr. σπέρμα ''sperma'', genitive σπέρματος ''spermatos'' – seed; φίλος ''philos'' – friend, lover). Habitat and behavior As typical ground squirr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joel Asaph Allen
Joel Asaph Allen (July 19, 1838 – August 29, 1921) was an American zoology, zoologist, mammalogy, mammalogist, and ornithology, ornithologist. He became the first president of the American Ornithologists' Union, the first curator of birds and mammals at the American Museum of Natural History, and the first head of that museum's Department of Ornithology. He is remembered for Allen's rule, which states that the bodies of endotherms (warm-blooded animals) vary in shape with climate, having increased surface area in hot climates to lose heat, and minimized surface area in cold climates, to conserve heat. Early life Allen was born in Springfield, Massachusetts, the son of Joel Allen and Harriet Trumbull. He studied and collected specimen of natural history early in life, but he was forced to sell his relatively large collection so that he could attend the Wilbraham & Monson Academy in 1861. The following year, he transferred to Harvard University, where he studied under Louis Agassi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rodent
Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are native to all major land masses except for New Zealand, Antarctica, and several oceanic islands, though they have subsequently been introduced to most of these land masses by human activity. Rodents are extremely diverse in their ecology and lifestyles and can be found in almost every terrestrial habitat, including human-made environments. Species can be arboreal, fossorial (burrowing), saltatorial/richochetal (leaping on their hind legs), or semiaquatic. However, all rodents share several morphological features, including having only a single upper and lower pair of ever-growing incisors. Well-known rodents include mice, rats, squirrels, prairie dogs, porcupines, beavers, guinea pigs, and hamsters. Rabbits, hares, and pikas, whose i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squirrel
Squirrels are members of the family Sciuridae, a family that includes small or medium-size rodents. The squirrel family includes tree squirrels, ground squirrels (including chipmunks and prairie dogs, among others), and flying squirrels. Squirrels are indigenous to the Americas, Eurasia, and Africa, and were introduced by humans to Australia. The earliest known fossilized squirrels date from the Eocene epoch, and among other living rodent families, the squirrels are most closely related to the mountain beaver and to the dormice. Etymology The word ''squirrel'', first attested in 1327, comes from the Anglo-Norman which is from the Old French , the reflex of a Latin word , which was taken from the Ancient Greek word (; from ) 'shadow-tailed', referring to the long bushy tail which many of its members have. The native Old English word for the squirrel, , survived only into Middle English (as ) before being replaced. The Old English word is of Common Germanic origin, cognat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molecular Phylogeny
Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to determine the processes by which diversity among species has been achieved. The result of a molecular phylogenetic analysis is expressed in a phylogenetic tree. Molecular phylogenetics is one aspect of molecular systematics, a broader term that also includes the use of molecular data in taxonomy and biogeography. Molecular phylogenetics and molecular evolution correlate. Molecular evolution is the process of selective changes (mutations) at a molecular level (genes, proteins, etc.) throughout various branches in the tree of life (evolution). Molecular phylogenetics makes inferences of the evolutionary relationships that arise due to molecular evolution and results in the construction of a phylogenetic tree. History The theoretical framew ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Spermophilus")
