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Biology Diversity in Living World part 9 (Species, Genus, Family) CBSE class 11 XI
Biology Diversity in Living World part 9 (Species, Genus, Family) CBSE class 11 XI
Published: 2014/03/09
Channel: ExamFear Education
Genus Meaning
Genus Meaning
Published: 2015/04/13
Channel: SDictionary
SVT Debatt - Genus-plogning
SVT Debatt - Genus-plogning
Published: 2016/02/27
Channel: Trippiic
Origins of Genus Homo: What Who When Where?; Early Body Form; Life History Patterns
Origins of Genus Homo: What Who When Where?; Early Body Form; Life History Patterns
Published: 2016/04/08
Channel: University of California Television (UCTV)
VIKTIGA SAKER: Kön & Genus
VIKTIGA SAKER: Kön & Genus
Published: 2015/01/20
Channel: Maktsalongen TV
TtHL: The Origin of Genus Homo
TtHL: The Origin of Genus Homo
Published: 2015/08/22
Channel: ExaByte Spyder
En fördjupande introduktion till Genus
En fördjupande introduktion till Genus
Published: 2014/01/13
Channel: Magister Mitterer
Genus - Dicen (Video Oficial)
Genus - Dicen (Video Oficial)
Published: 2017/05/14
Channel: Genus Oficial
Genus - Vad är egentligen genus, och hur funkar det?
Genus - Vad är egentligen genus, och hur funkar det?
Published: 2015/12/15
Channel: MrGipperth
Margonem "Genus" Top 3 !!!!!!!  Gościu expimy normalnie wbijaj :D Zapiska 3#
Margonem "Genus" Top 3 !!!!!!! Gościu expimy normalnie wbijaj :D Zapiska 3#
Published: 2017/05/18
Channel: Trexiu
x Texmaco vs genus
x Texmaco vs genus
Published: 2014/12/12
Channel: dika jpz
Genus - Wayne Mcgregor
Genus - Wayne Mcgregor
Published: 2011/03/12
Channel: GenericRoarkMkII
Margonem - Świat konkursowy Genus
Margonem - Świat konkursowy Genus
Published: 2017/04/25
Channel: Megas
Shakey Graves - Family and Genus
Shakey Graves - Family and Genus
Published: 2015/01/20
Channel: Steve Winwood
Genus | 2017 | The National Ballet of Canada
Genus | 2017 | The National Ballet of Canada
Published: 2017/03/30
Channel: The National Ballet of Canada
Wie du Genus, Numerus und Kasus bestimmst (Vorschau)
Wie du Genus, Numerus und Kasus bestimmst (Vorschau)
Published: 2016/02/10
Channel: Duden Learnattack
Das Genus - Deutsch - SchulLV [Volle Länge]
Das Genus - Deutsch - SchulLV [Volle Länge]
Published: 2016/06/15
Channel: SchulLV
Origins of Genus Homo–Australopiths and Early Homo; Variation of Early Homo; Speciation of Homo
Origins of Genus Homo–Australopiths and Early Homo; Variation of Early Homo; Speciation of Homo
Published: 2016/04/19
Channel: University of California Television (UCTV)
Genus  x Ponte Preta,  05/05/16 - Em Porto Velho - RO
Genus x Ponte Preta, 05/05/16 - Em Porto Velho - RO
Published: 2016/05/06
Channel: Elton Carvalho
Assista na íntegra -Semifinal Grupo C- Genus x Real Ariquemes - Rondoniense Sicoob 2017
Assista na íntegra -Semifinal Grupo C- Genus x Real Ariquemes - Rondoniense Sicoob 2017
Published: 2017/06/23
Channel: SGC Rondonia
São Paulo 6 x 0 Genus - Gols & Melhores Momentos - Copa São Paulo de Futebol Junior 03/01/2017 HD
São Paulo 6 x 0 Genus - Gols & Melhores Momentos - Copa São Paulo de Futebol Junior 03/01/2017 HD
Published: 2017/01/04
Channel: Gol7i
Genus 🌎 #MiniOscar2017 (Vencedor! [Melhor Filme])
Genus 🌎 #MiniOscar2017 (Vencedor! [Melhor Filme])
Published: 2017/02/22
Channel: MiniWorld Films
Świat konkursowy Genus - Margonem Technicznie
Świat konkursowy Genus - Margonem Technicznie
Published: 2017/04/26
Channel: Margonem
Aristotle on Species and Genus (Categories, c.5) - Philosophy Core Concepts
Aristotle on Species and Genus (Categories, c.5) - Philosophy Core Concepts
Published: 2017/03/10
Channel: Gregory B. Sadler
Shakey Graves - Family and Genus - 3/17/2015 - Riverview Bungalow, Austin, TX
Shakey Graves - Family and Genus - 3/17/2015 - Riverview Bungalow, Austin, TX
Published: 2015/06/15
Channel: Paste Magazine
Frida Ohlsson Sandahl, CRASH COURSE om kön, genus, jämställdhetsintegrering och heteronorm
Frida Ohlsson Sandahl, CRASH COURSE om kön, genus, jämställdhetsintegrering och heteronorm
Published: 2012/12/18
Channel: Frida Sandahl
Top 2 Świata "Genus" Margonem ! ;p
Top 2 Świata "Genus" Margonem ! ;p
Published: 2017/06/20
Channel: Trexiu
New Genus Solar Eclipse Fader ND and Polarizer Filter Review
New Genus Solar Eclipse Fader ND and Polarizer Filter Review
Published: 2016/09/27
Channel: DSLR Video Shooter
Shakey Graves - Family and Genus - Audiotree Live (4 of 4)
Shakey Graves - Family and Genus - Audiotree Live (4 of 4)
Published: 2016/02/22
Channel: Audiotreetv
Top 2 Świata "Genus" Margonem ! ;p Sobota Challenge Katahha
Top 2 Świata "Genus" Margonem ! ;p Sobota Challenge Katahha
Published: 2017/06/21
Channel: Trexiu
Genus Ovale
Genus Ovale
Published: 2016/09/20
Channel: Ovale - Sigarette Elettroniche Pisa
Pete Oak - Genus
Pete Oak - Genus
Published: 2016/06/15
Channel: Pretiosum
Shakey Graves "Family and Genus"
Shakey Graves "Family and Genus"
Published: 2016/01/15
Channel: AustinCityLimitsTV
🔴 Margonem "Genus" Top 3 !!!!!! Pająki here, questy ;D
🔴 Margonem "Genus" Top 3 !!!!!! Pająki here, questy ;D
Published: 2017/05/24
Channel: Trexiu
Genus - Mais um dia
Genus - Mais um dia
Published: 2017/02/03
Channel: Genus MC
GENUS, TÄNK OM
GENUS, TÄNK OM
Published: 2012/05/14
Channel: thelinproduction
Inside the Studio with Genus | 2017 | The National Ballet of Canada
Inside the Studio with Genus | 2017 | The National Ballet of Canada
Published: 2017/03/03
Channel: The National Ballet of Canada
Shakey Graves, "Family and Genus": Soundcheck (Live)
Shakey Graves, "Family and Genus": Soundcheck (Live)
Published: 2015/01/28
Channel: Napster
🔴 Margonem "Genus" Top 3 !!!!!! 214 lvl
🔴 Margonem "Genus" Top 3 !!!!!! 214 lvl
Published: 2017/05/25
Channel: Trexiu
Top 2 Świata "Genus" Margonem !!!! Nie poddajemy się !
Top 2 Świata "Genus" Margonem !!!! Nie poddajemy się !
Published: 2017/06/17
Channel: Trexiu
Gol: Genus-RO 1 x 0 São Raimundo-RR - Brasileiro Série D 2017
Gol: Genus-RO 1 x 0 São Raimundo-RR - Brasileiro Série D 2017
Published: 2017/06/19
Channel: CAMFWAYNE WORLD
Assista na íntegra Genus x Rondoniense– 4ª Rodada/1º Turno - Rondoniense Sicoob
Assista na íntegra Genus x Rondoniense– 4ª Rodada/1º Turno - Rondoniense Sicoob
Published: 2017/04/03
Channel: SGC Rondonia
Top 2 Świata "Genus" Margonem !!!!18:20  Łaznia !!!!! :D
Top 2 Świata "Genus" Margonem !!!!18:20 Łaznia !!!!! :D
Published: 2017/06/11
Channel: Trexiu
Wayne McGregor Rehearsing Genus – Facebook LIVE Recording  | 2017 | The National Ballet of Canada
Wayne McGregor Rehearsing Genus – Facebook LIVE Recording | 2017 | The National Ballet of Canada
Published: 2017/03/28
Channel: The National Ballet of Canada
Margonem Nowości - Genus, licytacje, exp
Margonem Nowości - Genus, licytacje, exp
Published: 2017/04/28
Channel: Majs Eks
David Tjeder föreläser om genus på Leda Mångfalt!
David Tjeder föreläser om genus på Leda Mångfalt!
Published: 2012/12/03
Channel: Riksutställningar / Swedish Exhibition Agency
Das Genus der Nomen im Deutschen
Das Genus der Nomen im Deutschen
Published: 2016/09/19
Channel: Who Knew
Gols: Ponte Preta 3 x 0 Genus - Copa do Brasil 2016
Gols: Ponte Preta 3 x 0 Genus - Copa do Brasil 2016
Published: 2016/05/13
Channel: CAMFWAYNE WORLD
Assista na íntegra Genus X Real Ariquemes– 5ª Rodada/1º Turno
Assista na íntegra Genus X Real Ariquemes– 5ª Rodada/1º Turno
Published: 2017/04/10
Channel: SGC Rondonia
Assista na íntegra Genus X Ji-Paraná – 1ª Rodada/1º Turno
Assista na íntegra Genus X Ji-Paraná – 1ª Rodada/1º Turno
Published: 2017/03/19
Channel: SGC Rondonia
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Life Domain Kingdom Phylum Class Order Family Genus Species
The hierarchy of biological classification's eight major taxonomic ranks. A family contains one or more genera. Intermediate minor rankings are not shown.

A genus (/ˈnəs/, pl. genera) is a taxonomic rank used in the biological classification of living and fossil organisms in biology. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus.

E.g. Felis catus and Felis silvestris are two species within the genus Felis. Felis is a genus within the family Felidae.

The composition of a genus is determined by a taxonomist. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however,[1] including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful:

  1. monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should clearly demonstrate both monophyly and validity as a separate lineage[2]).
  2. reasonable compactness – a genus should not be expanded needlessly; and
  3. distinctness – with respect to evolutionarily relevant criteria, i.e. ecology, morphology, or biogeography; DNA sequences are a consequence rather than a condition of diverging evolutionary lineages except in cases where they directly inhibit gene flow (e.g. postzygotic barriers).

Moreover, genera should be composed of phylogenetic units of the same kind as other (analogous) genera.[3]

Name[edit]

The term comes from the Latin genus ("origin; type; group; race"),[4] a noun form cognate with gignere ("to bear; to give birth to"). Linnaeus popularized its use in his 1753 Species Plantarum, but the French botanist Joseph Pitton de Tournefort (1656–1708) is considered "the founder of the modern concept of genera".[5]

Use[edit]

The scientific name of a genus may be called the generic name or generic epithet: it is always capitalized. It plays a pivotal role in binomial nomenclature, the system of naming organisms.

Binomial nomenclature[edit]

The rules for the scientific names of organisms are laid down in the Nomenclature Codes, which are employed by the speakers of all languages, giving each species a single unique Latinate name. The standard way of scientifically describing species and other lower-ranked taxa is by binomial nomenclature. The generic name forms its first half. For example, the gray wolf's binomial name is Canis lupus, with Canis (Lat. "dog") being the generic name shared by the wolf's close relatives and lupus (Lat. "wolf") being the specific name particular to the wolf. The specific name is written in lower-case and may be followed by subspecies names in zoology or a variety of infraspecific names in botany. Especially with these longer names, when the generic name is known from context, it is typically shortened to its initial letter.

Because animals are typically only grouped within subspecies, it is simply written as a trinomen with a third name. For example, because dogs are still so similar to wolves as to form part of their species but so distinct as to require separate treatment, they are described as C. lupus familiaris (Lat. "domestic"), while the "wolves" form many distinct subspecies, including the common wolf (C. lupus lupus) and the dingo (C. lupus dingo). Dog breeds, meanwhile, are not scientifically distinguished.

There are several divisions of plant species and therefore their infraspecific names generally include contractions explaining the relation. For example, the genus Hibiscus (Lat. "marshmallow") includes hundreds of other species apart from the Rose of Sharon or common garden hibiscus (H. syriacus, from Lat. "Syrian"). Rose of Sharon doesn't have subspecies but has cultivars that carry desired traits, such as the bright white H. syriaca 'Diana'.[6] "Hawaiian hibiscus", meanwhile, includes several separate species. Since not all botanists agree on the divisions or names between species, it is common to specify the source of the name using author abbreviations. For example, H. arnottianus A.Gray was first specified in a work by Asa Gray.[7] Sister Roe identified an immaculate white hibiscus on Molokai as a separate species,[8] but D.M. Bates later reclassified it as a subspecies of H. arnottianus.[9] It thus now appears as H. arnottianus ssp. immaculatus or as H. arnottianus A.Gray subsp. immaculatus (M.J.Roe) D.M.Bates. When it is considered a mere variety of H. arnottianus, it is written H. arnottianus var. immaculatus.

Type[edit]

Each genus should have a designated type, although in practice there is a backlog of older names without one. In zoology, this is the type species and the generic name is permanently associated with the type specimen of its type species. Should the specimen turn out to be assignable to another genus, the generic name linked to it becomes a junior synonym and the remaining taxa in the former genus need to be reassessed.

Identical names (synonyms and homonyms)[edit]

Within the same kingdom one generic name can apply to only one genus. However, many names have been assigned (usually unintentionally) to two or more different genera. For example, the platypus belongs to the genus Ornithorhynchus although George Shaw named it Platypus in 1799 (these two names are thus synonyms). However, the name Platypus had already been given to a group of ambrosia beetles by Johann Friedrich Wilhelm Herbst in 1793. A name that means two different things is a homonym. Since beetles and platypuses are both members of the kingdom Animalia, the name could not be used for both. Johann Friedrich Blumenbach published the replacement name Ornithorhynchus in 1800.

However, a genus in one kingdom is allowed to bear a scientific name that is in use as a generic name (or the name of a taxon in another rank) in a kingdom that is governed by a different nomenclature code. Names with the same form but applying to different taxa are called "homonyms". Although this is discouraged by both the International Code of Zoological Nomenclature and the International Code of Nomenclature for Algae, Fungi, and Plants, there are some five thousand such names in use in more than one kingdom. For instance,

A list of generic homonyms has been compiled by the Interim Register of Marine and Nonmarine Genera (IRMNG)[10]

Higher classifications[edit]

The type genus forms the base for higher taxonomic ranks, such as the family name Canidae ("Canids") based on Canis. However, this does not typically ascend more than one or two levels: the order to which dogs and wolves belong is Carnivora ("Carnivores").

Size[edit]

Number of reptile genera with a given number of species. Most genera have only one or a few species but a few may have hundreds. Based on data from the Reptile Database (as of May 2015).

The number of species in genera varies considerably among taxonomic groups. For instance, among (non-avian) reptiles, which have about 1180 genera, the most (>300) have only 1 species, ~360 have between 2 and 4 species, 260 have 5-10 species, ~200 have 11-50 species, and only 27 genera have more than 50 species (see figure).[11] However, some insect genera such as the bee genera Lasioglossum and Andrena have over 1000 species each.

Which species are assigned to a genus is somewhat arbitrary. Although all species within a genus are supposed to be "similar" there are no objective criteria for grouping species into genera. There is much debate among zoologists whether large, species-rich genera should be maintained, as it is extremely difficult to come up with identification keys or even character sets that distinguish all species. Hence, many taxonomists argue in favor of breaking down large genera. For instance, the lizard genus Anolis has been suggested to be broken down into 8 or so different genera which would bring its ~400 species to smaller, more manageable subsets.[12]

See also[edit]

References[edit]

  1. ^ Gill, F. B.; Slikas, B.; Sheldon, F. H. (2005). "Phylogeny of titmice (Paridae): II. Species relationships based on sequences of the mitochondrial cytochrome-b gene". Auk. 122 (1): 121–143. doi:10.1642/0004-8038(2005)122[0121:POTPIS]2.0.CO;2. 
  2. ^ De la Maza-Benignos, M. , Lozano-Vilano, M.L., & García-Ramírez, M. E. (2015). Response paper: Morphometric article by Mejía et al. 2015 alluding genera Herichthys and Nosferatu displays serious inconsistencies. Neotropical Ichthyology, 13(4), 673-676.http://www.scielo.br/scielo.php?pid=S1679-62252015000400673&script=sci_arttext
  3. ^ De la Maza-Benignos, M., Lozano-Vilano, M. L., & García-Ramírez, M. E. (2015). Response paper: Morphometric article by Mejía et al. 2015 alluding genera Herichthys and Nosferatu displays serious inconsistencies. Neotropical Ichthyology, 13(4), 673-676.http://www.scielo.br/scielo.php?pid=S1679-62252015000400673&script=sci_arttext
  4. ^ Merriam Webster Dictionary
  5. ^ Stuessy, T. F. (2009). Plant Taxonomy: The Systematic Evaluation of Comparative Data (2nd ed.). New York: Columbia University Press. p. 42. ISBN 9780231147125. 
  6. ^ "Hibiscus syriacus 'Diana'", Plants, Royal Horticultural Society, 2015, retrieved 7 October 2015 .
  7. ^ United States Exploring Expedition during the years 1838, 1839, 1840, 1841, 1842 under the Command of Charles Wilkes, U.S.N., Vol. XV: Botany, Pt. I, Philadelphia, 1854 .
  8. ^ Roe, Margaret James (1961), "A Taxonomic Study of the Indigenous Hawaiian Species of the Genus Hibiscus (Malvaceae)" (PDF), Pacific Science, Vol. 15, No. 1 .
  9. ^ Bates, David Martin (1989), Occasional Papers of the Bernice Pauahi Bishop Museum of Polynesian Ethology and Natural History, Vol. 29, No. 104 .
  10. ^ "IRMNG - Homonyms". www.irmng.org. Retrieved 2016-11-17. 
  11. ^ The Reptile Database
  12. ^ Nicholson, K. E.; B. I. Crother, C. Guyer & J.M. Savage (2012) It is time for a new classification of anoles (Squamata: Dactyloidae). Zootaxa 3477: 1–108

External links[edit]

External links[edit]

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