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nomen protectum

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It is possible for a junior synonym to be given precedence over a senior synonym,[6] primarily when the senior name has not been used since 1899, and the junior name is in common use. The older name becomes a nomen oblitum, and the junior name is declared a nomen protectum. This is primarily to prevent the confusion that would result if a well-known name, with a large accompanying body of literature, were to be replaced by a completely unfamiliar name. Such a reversal of precedence is also possible if the senior synonym was established after 1900, but only if the International Commission on Zoological Nomenclature (ICZN) approves an application. [see]

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