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Blacksburg Salamander
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 backgr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Walter B
Walter may refer to: People * Walter (name), both a surname and a given name * 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) 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-engines Films and television * ''Walter'' (1982 film), a British television drama film * Walter Vetrivel, a 1993 Tamil crime drama film * ''Walter'' (2014 film), a British television crime drama * ''Walter'' (2015 film), an American comedy-drama film * ''Walter'' (2020 film), an Indian crime drama film * ''W*A*L*T*E*R'', a 1984 pilot for a spin-off of the TV series ''M*A*S*H'' * ''W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lumpers And Splitters
Lumpers and splitters are opposing factions in any 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, assuming that differences are not as important as signature similarities. A "splitter" is one who 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 by Charles Darwin, in a letter to Joseph Dalton Hooker in 1857: ''It is good to have hair-splitters & lumpers''. They were introduced more widely by George G. Simpson in his 1945 work ''The Principles of Classification and a Classification of Mammals''. As he put it: A later use can be found in the title of a 1969 paper "On lumpers and splitters ..." by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic Amphibians Of The United States
Endemism is the state of a species being found 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 be also be referred to as an ''endemism'' or in scientific literature as an ''endemite''. For example '' Cytisus aeolicus'' is an endemite of the Italian flora. '' Adzharia renschi'' was once believed to be an endemite of the Caucasus, but it was later discovered to be a non-indigenous species from South America belonging to a different genus. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range. A rare alternative term for a species that is endemic is "precinctive", which applies to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plethodon
''Plethodon'' is a genus of salamanders in the family Plethodontidae. They are also known as woodland salamanders or, more rarely, slimy salamanders. All members of the genus are endemic to North America (Canada and USA). They have no aquatic larval stage. In some species, such as ''Plethodon cinereus'', the red-backed salamander, eggs are laid underneath a stone or log. 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. Species There are 56 species in the genus ''Plethodon''. Listed in alphabetical order of specific name: ''Nota bene'': A binomial authority In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ... in parentheses indicates that th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alleghany County, North Carolina
Alleghany County ( , from the North Carolina Collection website at the . Retrieved 2013-01-29.) is a located in the of . As of the [...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, N.C., Metropolitan Statistical Area, which is also included in the Greensboro-Winston-Salem- High Point, N.C., 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 influenced the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pittsylvania County, Virginia
Pittsylvania County is a county located in the Commonwealth of Virginia. As of the 2020 United States Census, the population was 60,501. Chatham is the county seat. Pittsylvania County is included in the Danville, VA Micropolitan Statistical Area. The largest undeveloped uranium deposit in the United States (7th 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 partitioned off ... [...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, VA Metropolitan Statistical 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 New Castle community, the county seat, has one of the commonwealth's antebellum court complexes, including a porticoed courthouse built in 1851. Craig Healing Springs, a collection of well-preserved early-20th-century resort buildings representative of the ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Giles County, Virginia
Giles County is a county located in the U.S. state of Virginia on the West Virginia state line. As of the 2020 census, the population was 16,787. Its county seat is Pearisburg. Giles County is included in the Blacksburg- Christiansburg, VA Metropolitan Statistical Area. Giles County is the location of 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. History Giles County was established in 1806 from Montgomery, Monroe, Wythe, and Tazewell counties. The county is named for William Branch Giles who was born in Amelia County in 1762. Giles became a lawyer and from there was elected to the United States House of Representatives where he served from 1790 to 1815. He also served in the Virginia General Assembly from 1816 to 1822. In 1827, he was elected Governor. In all, he served his nation and state around a total of forty years. ... [...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 biome on our planet, 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 more subtropical. Temperate forests typically have winters that often reach below freezing, however even this is not always true. The East Coast forests retain their deciduous n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roanoke County, Virginia
Roanoke County ( ) is a county located in the U.S. state of the Commonwealth of Virginia. As of the 2020 census, the population was 96,929. Its county seat is Salem, but the county administrative offices are located in the unincorporated Cave Spring area of the county. Roanoke County is part of the Roanoke, Virginia Metropolitan Statistical Area and located within the Roanoke Region of Virginia. The independent cities of Roanoke and Salem (incorporated as such in 1884 and 1968 respectively) are located within the boundaries of Roanoke County, but are not a part of the county. The town of Vinton is the only municipality within 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraphyly
In taxonomy, a group is paraphyletic if it consists of the group's last common ancestor and most of its descendants, excluding a few monophyletic subgroups. The group is said to be paraphyletic ''with respect to'' the excluded subgroups. In contrast, a monophyletic group (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 was coined by Willi Hennig to apply to well-known taxa like Reptilia ( reptiles) which, as commonly named and traditionally defined, is paraphyletic with respect to mammals and birds. Reptilia contains the last common ancestor of reptiles and all descendants of that ancestor, including all extant reptiles as well as the extinct synapsids, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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