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The PhyloCode
Chapter III. Names
Section 1. Status
Article 6.
6.1. Established names are those that are published in accordance with Art. 7 of this code. Unless a name is established, it has no status under this code.
Recommendation 6.1A. In order to distinguish scientific names from other (e.g., vernacular) names, all scientific names should be italicized when they appear in print.
Note 6.1A.1. Italicizing all scientific names is consistent with the 2006 edition of the ICBN but not with the 1999 edition of the ICZN.
Recommendation 6.1B. In order to indicate which names are established under this code and therefore have explicit phylogenetic definitions (and whose endings are not reflective of rank), it may be desirable to distinguish these names from supraspecific names governed by the rank-based codes, particularly when both are used in the same publication.
Example 1. The letter "P" (bracketed or in superscript) might be used to designate names governed by this code, and the letter "R" to designate names governed by the rank-based codes. Using this convention, the name "Ajugoideae[R]" would apply to a plant subfamily which may or may not be a clade, whereas "Teucrioideae[P]" would apply to a clade which may or may not be a subfamily.
Example 2. If the name Teucrioideae applied to both a clade (this code) and a subfamily (ICBN), they could be distinguished as Clade Teucrioideae versus Subfamily Teucrioideae.
6.2. Preexisting names are scientific names that, prior to their establishment under this code, were either: (a) "legitimate" (ICBN, ICNB), "potentially valid" (ICZN), or "valid" (ICVCN); or (b) in use but not governed by any code (e.g., zoological names ranked above the family group). In addition, scientific names governed by the ICBN that are in current or recent use but have never been published with a Latin description or diagnosis (and therefore violate ICBN [2006] Art. 36) are considered under this code to be preexisting names, provided that they have been published with a description or diagnosis in some other language and otherwise qualify as legitimate names under the ICBN.
Note 6.2.1. Names that were phylogenetically defined in publications (Art. 4) prior to the starting date of this code (Art. 7.1) and are not "legitimate" (ICBN, ICNB), "potentially valid" (ICZN), or "valid" (ICVCN) are considered to be preexisting names after the starting date of this code. They fall under Art. 6.2b because they are in use but were not governed by any code at the time they were published.
6.3. Converted names are preexisting names that have been established according to this code.
6.4. An acceptable name of a taxon is one that is in accordance with the rules of this code; that is, it is both (a) established and (b) not a non-conserved (Art. 15) later homonym.
6.5. The accepted name of a taxon is the name that must be adopted for it under this code. It must (1) be established (Art. 7), (2) have precedence (Arts. 1215) over alternative uses of the same name (homonyms) and alternative names for the same taxon (synonyms), and (3) not be rendered inapplicable by a qualifying clause in the context of a particular phylogenetic hypothesis (Art. 11.9).
6.6. Once a name has been established, its status as an acceptable and/or accepted name is not affected by inaccurate or misleading connotations; thus, a name is not to be rejected because of a claim that it denotes a character, distribution, or relationship not possessed by the taxon.