|
Plethodon Jacksoni
The Blacksburg salamander (''Plethodon jacksoni'') is a species of salamander in the family Plethodontidae. It is endemic to the Southeastern United States, where it is restricted to a portion of the Appalachian Mountains in southwestern Virginia (and possibly neighboring portions of North Carolina). Its common name refers the town of Blacksburg, Virginia, as many specimens were initially found in the vicinity of the town. Description ''Plethodon jacksoni'' is very similar in appearance to the Wehrle's salamander (''P. wehrlei'') in both proportions and color. It is slender in build, with a rounded head, large eyes, and a short snout. Males can reach up to in total length ( on average), with females up to , on average. Broadly speaking, ''P. jacksoni'' are larger than '' P. dixi'' and smaller than ''P. wehrlei''. Mature males have a prominent mental gland on the chin and swellings above the base of the tail, while females have proportionally longer bodies. The background col ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walter B
Walter may refer to: People and fictional characters * Walter (name), including a list of people and fictional and mythical characters with the given name or surname * Little Walter, American blues harmonica player Marion Walter Jacobs (1930–1968) * Gunther (wrestler), Austrian professional wrestler and trainer Walter Hahn (born 1987), who previously wrestled as "Walter" * Walter, standard author abbreviation for Thomas Walter (botanist) ( – 1789) * "Agent Walter", an early codename of Josip Broz Tito * Walter, pseudonym of the anonymous writer of '' My Secret Life'' * Walter Plinge, British theatre pseudonym used when the original actor's name is unknown or not wished to be included * John Walter (businessman), Canadian business entrepreneur Companies * American Chocolate, later called Walter, an American automobile manufactured from 1902 to 1906 * Walter Energy, a metallurgical coal producer for the global steel industry * Walter Aircraft Engines, Czech manufacturer of aero ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lumpers And Splitters
Lumpers and splitters are opposing factions in any academic discipline that has to place individual examples into rigorously defined categories. The lumper–splitter problem occurs when there is the desire to create classifications and assign examples to them, for example, schools of literature, biological taxa, and so on. A "lumper" is a person who assigns examples broadly, judging that differences are not as important as signature similarities. A "splitter" makes precise definitions, and creates new categories to classify samples that differ in key ways. Origin of the terms The earliest known use of these terms was thought to be Charles Darwin, in a letter to Joseph Dalton Hooker in 1857: "It is good to have hair-splitters & lumpers". But according to research done by the deputy director at NCSE, Glenn Branch, the credit is due to naturalist Edward Newman who wrote in 1845, "The time has arrived for discarding imaginary species, and the duty of doing this is as imperative ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic Amphibians Of The United States
Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can also be referred to as an ''endemism'' or, in scientific literature, as an ''endemite''. Similarly, many species found in the Western ghats of India are examples of endemism. Endemism is an important concept in conservation biology for measuring biodiversity in a particular place and evaluating the risk of extinction for species. Endemism is also of interest in evolutionary biology, because it provides clues about how changes in the environment cause species to undergo range shifts (potentially expanding their range into a larger area or becomin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plethodon
''Plethodon'' is a genus of salamanders in the family Plethodontidae. They are commonly known as woodland salamanders. All members of the genus are endemic to North America (Canada and the United States). They have no aquatic larval stage. In some species, such as the red-backed salamander (''Plethodon cinereus''). Young hatch in the adult form. Members of ''Plethodon'' primarily eat small invertebrates. The earliest known fossils of this genus are from the Hemphillian of Tennessee in the United States. Taxonomy ''Plethodon'' is part of the family Plethodontidae (lungless salamanders) and the subfamily Plethodontidae, Plethodontinae. The genus ''Plethodon'' can be divided into two Subgenus, subgenera: the nominal subgenus ''Plethodon'', which includes up to 49 eastern species (the bulk of diversity in the genus), and the subgenus ''Hightonia'', which includes 9 species native to the western part of North America. The eastern ''Plethodon'' subgenus can be further categorized int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alleghany County, North Carolina
Alleghany County ( ) , from the North Carolina Collection website at the University of North Carolina at Chapel Hill. Retrieved January 29, 2013. is a County (United States), county located in the U.S. state of North Carolina. The population was 10,888 at the 2020 United States census, 2020 census. Its county seat is Sparta, North Carolina, Sparta. History The earliest inhabitants of the area eventually comprising Alleghany County were Cherokee and Shawnee Native Americans. By the late 1700s these people had been displaced by English, German, and Scotch-Irish settlers. The county was formed in 1859 from the eastern part of Ashe County, North Carolina, Ashe County. A group of commissioners selected a site near the center of the co ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stokes County, North Carolina
Stokes County is a county located in the U.S. state of North Carolina. As of the 2020 census, the population was 44,520. Its county seat is Danbury. Stokes County is included in the Winston-Salem, NC, Metropolitan Statistical Area, which is also included in the Greensboro–Winston-Salem–High Point, NC, Combined Statistical Area. History The county was formed in 1789 from Surry County, and before 1770, it was part of Rowan County. It was named for John Stokes, an American Revolutionary War captain severely wounded when British Colonel Banastre Tarleton's cavalry practically destroyed Col. Abraham Buford's Virginia regiment in the Waxhaws region in 1780. After the war, Captain Stokes was appointed a judge of the United States district court for North Carolina. In 1849 the southern half of Stokes County became Forsyth County. Stokes was most heavily settled from 1750 to 1775. The Great Wagon Road passed through the eastern portion of the county, and this influen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pittsylvania County, Virginia
Pittsylvania County is a county located in the Commonwealth of Virginia, United States. At the 2020 census, the population was 60,501. The county seat is Chatham. Pittsylvania County is included in the Danville, VA Micropolitan Statistical Area. The largest undeveloped uranium deposit in the United States (seventh largest in the world) is located in Pittsylvania County. (see '' Uranium mining in Virginia''.) History Originally "Pittsylvania" was a name suggested for an unrealized British colony to be located primarily in what is now West Virginia. Pittsylvania County would not have been within this proposed colony, which subsequently was named Vandalia. Pittsylvania County was formed in 1767 with territory annexed from Halifax County. It was named for William Pitt, 1st Earl of Chatham, who served as Prime Minister of Great Britain from 1766 to 1768, and who opposed some harsh colonial policies of the period. In 1777 the western part of Pittsylvania County was partitione ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Craig County, Virginia
Craig County is a county located in the Commonwealth of Virginia. As of the 2020 census, the population was 4,892. Its county seat is New Castle. Craig County is part of the Roanoke metropolitan area. History Nestled in the mountains of Southwest Virginia, Craig County was named for Robert Craig, a 19th-century Virginia congressman. The initial outpost in the area was called "Craig's Camp," and it is claimed that George Washington visited it in 1756 during his travels to the frontier. Formed from parts of Botetourt, Roanoke, Giles, and Monroe (in present-day West Virginia) counties in 1851, Craig was later enlarged with several subsequent additions from neighboring counties. The secluded, mountainous town of New Castle, the county seat, has one of the commonwealth's antebellum court complexes, including a porticoed courthouse built in 1852. Craig Healing Springs, a collection of well-preserved early-20th-century resort buildings representative of the architecture of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giles County, Virginia
Giles County is a county (United States), county located in the U.S. state of Virginia on the West Virginia state line. As of the 2020 United States census, 2020 census, the population was 16,787. Its county seat is Pearisburg, Virginia, Pearisburg. Giles County is included in the Blacksburg–Christiansburg metropolitan area. Giles County is the location of Mountain Lake (Virginia), Mountain Lake, one of only two natural fresh water lakes in Virginia. The lake drains into Little Stony Creek, which passes over a waterfall known as The Cascades before reaching the New River (Kanawha River), New River. History Giles County was established in 1806 from Montgomery County, Virginia, Montgomery, Monroe County, West Virginia, Monroe, Wythe County, Virginia, Wythe, and Tazewell County, Virginia, Tazewell counties. The county is named for William Branch Giles who was born in Amelia County, Virginia, Amelia County in 1762. Giles became a lawyer and from there was elected to the United ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temperate Forest
A temperate forest is a forest found between the tropical and boreal regions, located in the temperate zone. It is the second largest terrestrial biome, covering 25% of the world's forest area, only behind the boreal forest, which covers about 33%. These forests cover both hemispheres at latitudes ranging from 25 to 50 degrees, wrapping the planet in a belt similar to that of the boreal forest. Due to its large size spanning several continents, there are several main types: deciduous, coniferous, mixed forest, and rainforest. Climate The climate of a temperate forest is highly variable depending on the location of the forest. For example, Los Angeles and Vancouver, Canada are both considered to be located in a temperate zone, however, Vancouver is located in a temperate rainforest, while Los Angeles is a relatively dry subtropical climate. Types of temperate forest Deciduous They are found in Europe, East Asia, North America, and in some parts of South America. Deciduous fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roanoke County, Virginia
Roanoke County ( ) is a county in the U.S. state of the Commonwealth of Virginia. As of the 2020 census, its population was 96,929. Its county seat is Salem, but the county administrative offices are located in the census-designated place of Cave Spring. Roanoke County is part of the Roanoke, Virginia Metropolitan Statistical Area, and is in the Roanoke Region of Virginia. The independent cities of Roanoke and Salem (incorporated as such in 1884 and 1968 respectively) are inside the boundaries of Roanoke County but are not a part of the county. The town of Vinton is the only municipality in the county. While significant areas of the county are rural and mountainous, most residents live in the suburbs near Roanoke and Salem in the Roanoke Valley. History The county was established by an act of the Virginia Legislature on March 30, 1838, from the southern part of Botetourt County. It was named for the Roanoke River, which in turn was derived from a Native America ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraphyly
Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In contrast, a monophyletic grouping (a clade) includes a common ancestor and ''all'' of its descendants. The terms are commonly used in phylogenetics (a subfield of biology) and in the tree model of historical linguistics. Paraphyletic groups are identified by a combination of synapomorphies and symplesiomorphies. If many subgroups are missing from the named group, it is said to be polyparaphyletic. The term received currency during the debates of the 1960s and 1970s accompanying the rise of cladistics, having been coined by zoologist Willi Hennig to apply to well-known taxa like Reptilia (reptiles), which is paraphyletic with respect to birds. Reptilia contains the last common ancestor of reptiles and all descendants of that ancest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
