[:Chapter6:Chapter 6: Validity of Names and Nomenclatural Acts]

Article 24. Precedence between simultaneously published names, spellings or acts.

24.1. Automatic determination of precedence of names. When homonyms or synonyms are established simultaneously, but proposed at different ranks, in the family group, genus group or species group the name proposed at higher rank takes precedence [Arts. 55.5, 56.3, 57.7]. See Article 61.2.1 for the precedence of simultaneous but different type fixations for taxa and their nominotypical subordinate taxa.

Example. The simultaneously established species-group names vulgaris Schmidt and sinensis Chang are considered to be synonyms; sinensis, proposed for a species, takes precedence over vulgaris because the latter was proposed for a subspecies.

24.2. Determination by the First Reviser.

Recommendation 24A. Action of First Reviser. In acting as First Reviser in the meaning of this Article, an author should select the name, spelling or nomenclatural act that will best serve stability and universality of nomenclature.

Recommendation 24B. First Revisers choosing between identical names should follow contemporary attributions of authorship. Zoologists acting as First Revisers to determine the precedence of identical names published in the same or different works, and on the same day, are advised to follow attributions by the authors concerned if these are known (see Article 50.6).

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