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In zoology, the Principle of Binominal Nomenclature is one of the guiding principles of the International Code of Zoological Nomenclature.
It states that the system of nomenclature for animals is binominal nomenclature:
- species have a name composed of two names, a "binomen": a generic name and a specific name. No other rank can have a name composed of two names:
- subspecies have a name composed of three names, a "trinomen": generic name, specific name, subspecific name:
- taxa at a rank above species have a name composed of one name, a "uninominal name".
In botanical nomenclature, the equivalent for "binominal nomenclature" is "binary nomenclature" (or sometimes "binomial nomenclature").
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