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(biology) the species that best exemplifies the essential characteristics of the genus to which it belongs
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The species upon which a genus is based (a genus may contain many species but only one designated species is its type species).
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The species selected as a type for a taxon.
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A species that has been selected as the standard bearer of a genus or subgenus
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(ICZN) the species that is the name-bearing type of a genus or subgenus. (In contrast, according to the ICBN the type of a genus or subgenus is a specimen.)
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The nominal species that is the name-bearing type of a nominal genus or subgenus.
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A type species is the species of an organism from which a new genus is named. For example, Tyrannosaurus rex is the type species for the genus Tyrannosaurus.
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A type species fixes the name of a genus (or of a taxon in a rank lower than genus).
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