The date of protection does not affect the date of a protected name, which is the date of its establishment (Art. 19.1).
When, for a taxon of the species group, two or more protected names and/or two or more names with the same final epithet and type as a protected name compete, Art. 19.4 governs the choice of name.
When, for a taxon of the family or genus group, two or more protected names compete, Art. 19.3 governs the choice of name (see also Art. 20.9).
An earlier homonym of a protected name does not lose its status of an established name, but the precedence of the two homonyms is inverted by protection.
Once a list has been adopted, entries can be added, modified or removed only by the mechanisms of conservation or suppression of names (Art. 21–23). Specified restrictions and exceptions can be waived or modified only upon recommendation of the appropriate committee.
Protection can, for individual lists, be restricted with respect to the options set out in Art. 20.2, and particular entries on a list can be exempted from protection. Such restrictions and exceptions are to be specified.
Once a List has been adopted, all listed names and their co-ordinate names are protected. A protected name is treated as if conserved against earlier homonyms and unlisted competing names; it is treated as established in the place and on the date cited in the list; and its type, when listed, its spelling and, if specified, its gender are treated as if conserved.
In order to stabilise the nomenclatural status of names in current use, and to prevent their being displaced by names no longer in use, Lists of names and their attributes may, after apposite public review, be submitted to the ICB for adoption (see Div. III.9).
Ex. 1. The Approved Lists of Bacterial Names (see Rule 24a of the bacteriological Code) are, for all events and purposes, equivalent to the Adopted Lists provided for in the BioCode.
Provision of an illustration or figure showing diagnostic characters is recommended for all new taxa, especially for those of zoological fossils as well as ambiregnal and any microscopic organisms.
On or after a future date to be determined (Div. III.4) a name of a new fossil botanical species or subordinate taxon, in order to be established, must be accompanied by an illustration or figure showing diagnostic characters, in addition to the description or diagnosis, or by a bibliographic reference to a previously published illustration or figure. This requirement also applies to names of new non-fossil algal taxa at these ranks.