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In biology, a genus (plural: genera) is a taxonomic unit (a taxon) used in the classification of living and fossil organisms. The term comes from Latin genus "descent, family, type, gender",[1] cognate with Greek: γένοςgenos, "race, stock, kin".[2]
Life Domain Kingdom Phylum Class Order Family Genus Species

Enlarge
The hierarchy of biological classification's eight major taxonomic ranks. .A family contains one or more genera.^ FAMILY -- One genus or several genera which have a basically similar floral pattern make up a family.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

Intermediate minor rankings are not shown.
The composition of a genus is determined by a taxonomist. .The standards for genus classification are not strictly codified, and hence different authorities often produce different classifications for genera.^ BIGENERIC -- A hybrid produced by crossing two different genera.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

In the hierarchy of the binomial classification system, genus comes above species and below family.

Contents

Generic name

.The scientific name of a genus may be called the generic name: it is always capitalized.^ The name of the genus is incorporated into the scientific names of all the member species: Pieris napi and Pieris rapae , for example, both belong to the genus Pieris .
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

It plays a pivotal role in binomial nomenclature, the system of biological nomenclature.

Binomial nomenclature

The rules for scientific names are laid down in the Nomenclature Codes; depending on the kind of organism and the Kingdom it belongs to, a different Code may apply, with different rules, laid down in a different terminology. .The advantages of scientific over common names are that they are accepted by speakers of all languages, and that each species has only one name.^ Feeding upon only one kind of food, for example one species or one genus of plants.
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

^ When such an instance comes to light one of the species must be given another name.
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

^ There is only one botanical name per plant so if you want a specific variety, use it's botanical name to be sure you're getting what you want.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

.This reduces the confusion that may arise from the use of a common name to designate different things in different places (example elk), or from the existence of several common names for a single species.^ SPECIES -- Used when naming plants.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

^ The name of an instrument used for the transfer of a ship, while she is at sea; it differs from a common bill of sale.
  • Bouvier's Law Dictionary, 1856 Edition - Letter G 30 January 2010 2:02 UTC www.constitution.org [Source type: Original source]

^ Designates a specific species of the 'Genus' and is best described as the plant worlds equivalent to our Christian names (or first names).
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

.It is possible for a genus to be assigned to a kingdom governed by one particular Nomenclature Code by one taxonomist, while other taxonomists assign it to a kingdom governed by a different Code, but this is the exception, not the rule.^ A contract between two or more persons by which they agree to play by certain rules at cards, dice, or other contrivance, and that one shall be the loser, and the other the winner.
  • Bouvier's Law Dictionary, 1856 Edition - Letter G 30 January 2010 2:02 UTC www.constitution.org [Source type: Original source]

^ Governments are also divided into monarchical and republican; among the monarchical states may be classed empires, kingdoms, and others; in these the sovereignty resides in, a single individual.
  • Bouvier's Law Dictionary, 1856 Edition - Letter G 30 January 2010 2:02 UTC www.constitution.org [Source type: Original source]

^ One which is employed by the master or owners, on a particular voyage, and is hired by a number of persons, unconnected with each other, to convey their respective goods to the place of destination.
  • Bouvier's Law Dictionary, 1856 Edition - Letter G 30 January 2010 2:02 UTC www.constitution.org [Source type: Original source]

Pivotal in binomial nomenclature

The generic name often is a component of the names of taxa of lower rank. .For example, Canis lupus is the scientific name of the Gray wolf, a species, with Canis the generic name for the dog and its close relatives, and with lupus particular (specific) for the wolf (lupus is written in lower case).^ Designates a specific species of the 'Genus' and is best described as the plant worlds equivalent to our Christian names (or first names).
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

Similarly, Canis lupus familiaris is the scientific name for the domestic dog.
Taxonomic units in higher ranks often have a name that is based on a generic name, such as the family name Canidae, which is based on Canis. .However, not all names in higher ranks are necessarily based on the name of a genus: for example, Carnivora is the name for the order to which the dog belongs.^ A division of the animal kingdom lower than a phylum and higher than an order, for example the class Insecta.
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

^ The name of the genus is incorporated into the scientific names of all the member species: Pieris napi and Pieris rapae , for example, both belong to the genus Pieris .
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

The problem of identical names used for different genera

.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.^ GENUS -- Used when naming plants.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

^ When such an instance comes to light one of the species must be given another name.
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

^ There is only one botanical name per plant so if you want a specific variety, use it's botanical name to be sure you're getting what you want.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

.Although this is discouraged by both the International Code of Zoological Nomenclature and the International Code of Botanical Nomenclature, there are some five thousand such names that are in use in more than one kingdom.^ PALMATE LEAF -- Five or more lobes arising from one point -- hand-like.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

^ Flagellum not more than twice as long as preceding two segments and one-quarter as wide as long .
  • Key to the Eastern Asilid genera 22 September 2009 20:28 UTC www.hr-rna.com [Source type: FILTERED WITH BAYES]

^ There is only one botanical name per plant so if you want a specific variety, use it's botanical name to be sure you're getting what you want.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

For instance, Anura is the name of the order of frogs but also is the name of a genus of plants (although not current: it is a synonym); Aotus is the genus of golden peas and night monkeys; Oenanthe is the genus of wheatears and water dropworts, and Prunella is the genus of accentors and self-heal.
.Within the same kingdom one generic name can apply to only one genus.^ There is only one botanical name per plant so if you want a specific variety, use it's botanical name to be sure you're getting what you want.
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

^ It denotes the number of beings, or objects, which agree in certain general properties, common to them all, so that genus is, in fact, only an abstract idea, expressed by some general name or term; or rather a name or term, to signify what is called au abstract idea.
  • Bouvier's Law Dictionary, 1856 Edition - Letter G 30 January 2010 2:02 UTC www.constitution.org [Source type: Original source]

^ Children stand to each other in the relation either of full blood or half blood, according as they are descended from the same parents, or have only one parent in common.
  • Bouvier's Law Dictionary, 1856 Edition - Letter G 30 January 2010 2:02 UTC www.constitution.org [Source type: Original source]

.This explains why the platypus genus is named OrnithorhynchusGeorge Shaw named it Platypus in 1799, but the name Platypus had already been given to a group of ambrosia beetles by Johann Friedrich Wilhelm Herbst in 1793. Names with the same form but applying to different taxa are called homonyms.^ Name given to a young insect which is markedly different from the adult: caterpillars and fly maggots are good examples.
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

^ A difference in size, form, or color, between individuals of the same species, characterizing two distinct types.
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

^ A scientific name which has been given to two different species.
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

Since beetles and platypuses are both members of the kingdom Animalia, the name Platypus could not be used for both. Johann Friedrich Blumenbach published the replacement name Ornithorhynchus in 1800.

Types and genera

.Because of the rules of scientific naming, or "binomial nomenclature", each genus should have a designated type, although in practice there is a backlog of older names that may not yet have a type.^ Designates a specific species of the 'Genus' and is best described as the plant worlds equivalent to our Christian names (or first names).
  • The GreenWeb - GreenWeb's Gardening Glossary 30 January 2010 2:02 UTC www.boldweb.com [Source type: FILTERED WITH BAYES]

.In zoology this is the type species (see Type (zoology)); the generic name is permanently associated with the type specimen of its type species.^ The type specimen of a species is the actual insect from which the original description of that species was produced.
  • Gordon's Entomological Glossary 30 January 2010 2:02 UTC www.earthlife.net [Source type: FILTERED WITH BAYES]

Should this 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.
See scientific classification and Nomenclature Codes for more details of this system. Also see type genus.

Guidelines

There are no hard and fast rules that a taxonomist has to follow in deciding what does and what does not belong in a particular genus. .This does not mean that there is no common ground among taxonomists in what constitutes a "good" genus.^ So does that mean that the evolution of genus Homo was a fluke?
  • Chromosome Fusion Disproves Evolution - talk.origins | Google Groups 30 January 2010 2:02 UTC groups.google.com [Source type: FILTERED WITH BAYES]

^ A good start is to keep these amongst there own genus, oxy's to oxy's mycediums with mycediums etc.
  • Chalices sting other chalices ? - Reef Central Online Community 30 January 2010 2:02 UTC www.reefcentral.com [Source type: General]

^ So > > does that mean that the evolution of genus Homo was a fluke?
  • Chromosome Fusion Disproves Evolution - talk.origins | Google Groups 30 January 2010 2:02 UTC groups.google.com [Source type: FILTERED WITH BAYES]

For instance, some rules-of-thumb for delimiting a genus are outlined in Gill. [3] According to these, a genus should fulfill three criteria to be descriptively useful:
  1. monophyly – all descendants of an ancestral taxon are grouped together;
  2. reasonable compactness – a genus should not be expanded needlessly; and
  3. distinctness – in regards of evolutionarily relevant criteria, i.e. ecology, morphology, or biogeography; note that DNA sequences are a consequence rather than a condition of diverging evolutionarily lineages except in cases where they directly inhibit gene flow (e.g. postzygotic barriers).

Nomenclature

...difficulties occurring in generic nomenclature: similar cases abound, and become complicated by the different views taken of the matter by the various taxonomists.
—Prof. C. S. Rafinesque. 1836[4]
None of the Nomenclature Codes require such criteria for defining a genus, because these are concerned with the nomenclature rules, not with taxonomy. These regulate formal nomenclature, aiming for universal and stable scientific names.

See also

External links

References

  1. ^ Merriam Webster Dictionary
  2. ^ Genos, Henry George Liddell, Robert Scott, A Greek-English Lexicon, at Perseus
  3. ^ Gill, F. B., B. Slikas, and F. H. Sheldon. “Phylogeny of titmice (Paridae): II. Species relationships based on sequences of the mitochondrial cytochrome-b gene.” Auk 122(1): 121-143, 2005. (Google Scholar)
  4. ^ Rafinesque, Prof. C. S. (1836). "Generic Rules" (html). Flora telluriana Pars Prima First Part of the Synoptical Flora Telluriana, Centuries I, II, III, IV. With new Natural Classes, Orders and families: containing the 2000 New or revised Genera and Species of Trees, Palms, Shrubs, Vines, Plants, Lilies, Grasses, Ferns, Algas, Fungi, & c. from North and South America, Polynesia, Australia, Asia Europe and Africa, omitted or mistaken by the authors, that were observed or ascertained, described or revised, collected or figured, between 1796 and 1836.. 1. Philadelphia: H. Probasco. http://www.us.archive.org/GnuBook/?id=floratelluriana00rafi#99. Retrieved 2009-04-02. "...difficulties occurring in generic nomenclature: similar cases abound, and become complicated by the different views taken of the matter by the various botanists."  

Wiktionary

Up to date as of January 15, 2010
(Redirected to genus article)

Definition from Wiktionary, a free dictionary

Contents

English

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Etymology

< Latin genus (birth, origin, a race, sort, kind) < root gen in Latin gignere, Old Latin gegnere (to beget, produce)

Pronunciation

Noun

Singular
genus
Plural
genera
genus (plural genera)
  1. (biology, taxonomy) a rank in the classification of organisms, below family and above species; a taxon at that rank
    All magnolias belong to the genus Magnolia.
    Other species of the genus Bos are often called cattle or wild cattle.
  2. A group with common attributes
  3. (topology) A number measuring some aspect of the complexity of any of various manifolds or graphs
  4. (semantics) Within a definition, a broader category of the defined concept.

Synonyms

Derived terms

Related terms

See also

Translations

The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Help:How to check translations.

External links

  • genus in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
  • genus in The Century Dictionary, The Century Co., New York, 1911

Anagrams


Dutch

Etymology

From Latin genus

Noun

genus n. (plural genera, no diminutive)
  1. (botany) a rank in a taxonomic classification, in between family and species.
  2. (botany) a taxon at this rank
  3. (linguistics) gender

Synonyms


Latin

Etymology 1

From Proto-Indo-European *ǵénh₁os (race). Cognates include Ancient Greek γένος (genos), race, stock, kin, kind), Sanskrit जनस् (jánas), race, class of beings).

Noun

genus (genitive generis); n, third declension
  1. birth, origin
  2. kind, type, class
  3. set, group (with common attributes)
Inflection
Number Singular Plural
nominative genus genera
genitive generis generum
dative generī generibus
accusative genus genera
ablative genere generibus
vocative genus genera
Derived terms
Related terms
Descendants

Etymology 2

Inflection of genū

Noun

genūs
  1. genitive singular of genū

Etymology 3

Inflection of genus

Noun

genus
  1. accusative singular of genus
  2. vocative singular of genus

Swedish

Etymology 1

Noun

genus n.
Inflection for genus Singular Plural
neuter Indefinite Definite Indefinite Definite
Base form genus genuset genus genusen
Possessive form genus genusets genus genusens
  1. (grammar) gender (division of nouns and pronouns)

Etymology 2

Inflection of genus

Noun

genus
  1. indefinite genitive singular of genus
  2. plural form of genus
  3. indefinite genitive plural of genus

Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Taxonavigation

Main Page
Superregnum: Superregnum
Regnum: Regnum
Phylum: Phylum
Classis: Classis
Ordo: Ordo
Familia: Familia
Tribus: Tribus
Supergenus: Supergenus
Genus: Genus
Subgenera: Subgenus 1 - Subgenus 2 - Subgenus 3


.This template is not a rule, not even a guideline.^ This template is not a rule, not even a guideline.

.It is a mere attempt to stimulate a discussion about the navigation in wikispecies.^ It is a mere attempt to stimulate a discussion about the navigation in wikispecies.

Please discuss this at the Village pump
edit

Simple English

A Genus is a group of living things that are similar. Grouping creatures in a scientific way is a kind of taxonomy. When scientists talk about one genus of animals or plants, they mean several species of those animals or plants that are closely related to each other.

The word changes differently from other English words because it comes from Latin. Genus is the singular for only one group, and genera is the plural form of the word for two or more groups. Several genera make up a family.

When writing a scientific name of an organism, you need to write the name with the genus in front. For example, "Felis silvestris catus", Felis is the genus. The genus must always begin with a capital letter.

Some people use a special rhyme or sentence called a mnemonic to help remember something difficult like a list. In one mnemonic to remember biological taxonomy, genus is the word glass. Here is one example: "Kings play chess on folding glass stools" to remember "Kingdom, phylum, class, order, family, genus, species".



Citable sentences

Up to date as of December 13, 2010

Here are sentences from other pages on Genus, which are similar to those in the above article.








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