(ICZN); if a name is unavailable, then it cannot be considered either valid or invalid.

In contrast, a name which is available but not the correct name for a taxon is known as an invalid name.

There are two categories of invalid names.

Subjectively invalid names

Subjectively invalid names are names that have been rendered invalid by individual scientific judgement or opinion. Taxonomists may differ in their opinion, and names considered invalid by one researcher may be considered valid by another.

They

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