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In biology, a homonym is a name for a taxon that is identical in spelling to another such name, that belongs to a different taxon.. The rule in the International Code of Zoological Nomenclature is that the first such name to be published is the senior homonym and is to be used (it is "valid"); any others are junior homonyms and must be replaced with new names.
Some spelling variants are explicitly defined by the Code as being homonyms. Otherwise the one-letter difference rule applies. In species, primary homonyms are those with the same genus and same species in their original combination. The difference between a junior primary homonym and a subsequent use of a name is undefined, but it is commonly ...
homonym: names spelled identically, but, in some codes, names spelled similarly, as defined by the code senior homonym (zoology): the first legitimate use of the name which generally takes priority; junior homonym (zoology), later homonym (botany): a later and generally illegitimate use, though in some circumstances the later name is allowed to ...
Junior homonyms in the family and genus group – names of families and genera which have identical spelling, but refer to different taxa. Only one of two (or more) such homonyms can be valid; junior family-rank names must typically either change their spelling or be replaced, while junior genus-rank homonyms must be replaced. [2]
Priority is a principle in biological taxonomy by which a valid scientific name is established based on the oldest available name. It is a decisive rule in botanical and zoological nomenclature to recognise the first binomial name (also called binominal name in zoology) given to an organism as the correct and acceptable name.
In taxonomy, synonyms are not equals, but have a different status. For any taxon with a particular circumscription, position, and rank, only one scientific name is considered to be the correct one at any given time (this correct name is to be determined by applying the relevant code of nomenclature). A synonym cannot exist in isolation: it is ...
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The starting point, that is the time from which these codes are in effect (usually retroactively), varies from group to group, and sometimes from rank to rank. [7] In botany and mycology, the starting point is often 1 May 1753 (Linnaeus, Species plantarum).