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In biological taxonomy the type genus is the
genus Genus /ˈdʒiː.nəs/ (plural genera /ˈdʒen.ər.ə/) is a taxonomic rank In biological classification In biology, taxonomy () is the scientific study of naming, defining (Circumscription (taxonomy), circumscribing) and classifying gr ...
which defines a
biological family Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order (biology), order and genus. A family may be divided into subfamily, subfamilies, which are intermediate r ...
and the root of the family name.


Zoological nomenclature

According to the
International Code of Zoological Nomenclature The International Code of Zoological Nomenclature (ICZN) is a widely accepted in that rules the formal of treated as s. It is also informally known as the ICZN Code, for its publisher, the (which shares the acronym "ICZN"). The rules princi ...
, "The name-bearing type of a nominal family-group taxon is a nominal genus called the 'type genus'; the family-group name is based upon that of the type genus." Any family-group name must have a type genus (and any genus-group name must have a
type species In zoological nomenclature The International Code of Zoological Nomenclature (ICZN) is a widely accepted Convention (norm), convention in zoology that rules the formal scientific name, scientific naming of organisms treated as animals. It is al ...
, but any species-group name may, but need not, have one or more type specimens). The type genus for a family-group name is also the genus that provided the stem to which was added the ending -idae (for families). :Example: The family name Formicidae has as its type genus the genus ''
Formica ''Formica'' is a genus Genus /ˈdʒiː.nəs/ (plural genera /ˈdʒen.ər.ə/) is a taxonomic rank In biological classification In biology, taxonomy () is the scientific study of naming, defining (Circumscription (taxonomy), circums ...

Formica
'' Linnaeus, 1758.


Botanical nomenclature

In
botanical nomenclature Botanical nomenclature is the formal, scientific naming of plants. It is related to, but distinct from taxonomy Taxonomy (general) is the practice and science of classification of things or concepts, including the principles that underlie such ...
, the phrase "type genus" is used, unofficially, as a term of convenience. In the '' ICN'' this phrase has no status. The code uses type specimens for ranks up to family, and types are optional for higher ranks. The Code does not refer to the genus containing that type as a "type genus". :Example: "''
Poa ''Poa'' is a of about 500 of es, native to the temperate regions of both hemispheres. Common names include meadow-grass (mainly in Europe and Asia), bluegrass (mainly in North America), tussock (some species), and speargrass. ''Poa'' () is ...

Poa
'' is the type genus of the family
Poaceae Poaceae () or Gramineae () is a large and nearly ubiquitous family In , family (from la, familia) is a of people related either by (by recognized birth) or (by marriage or other relationship). The purpose of families is to maintain ...
and of the order
Poales The Poales are a large order Order or ORDER or Orders may refer to: * Orderliness Orderliness is associated with other qualities such as cleanliness Cleanliness is both the abstract state of being clean and free from germs, dirt, trash, or wa ...
" is another way of saying that the names Poaceae and Poales are based on the generic name ''Poa''.


See also

* Principle of Typification *
Type (biology) In biology, a type is a particular specimen (or in some cases a group of specimens) of an organism In biology, an organism () is any organic, life, living system that functions as an individual entity. All organisms are composed of ce ...
*
Type species In zoological nomenclature The International Code of Zoological Nomenclature (ICZN) is a widely accepted Convention (norm), convention in zoology that rules the formal scientific name, scientific naming of organisms treated as animals. It is al ...


References

{{reflist Taxonomy (biology) Zoological nomenclature Botanical nomenclature