International Commission on Zoological Nomenclature
 INTERNATIONAL CODE OF ZOOLOGICAL NOMENCLATURE online

Article 19. Status of emendations, incorrect spellings, and mandatory changes.

19.1. Unjustified emendations and incorrect spellings. An unjustified emendation of an available name is itself an available name [Art. 33.2.3], provided that it meets the other requirements for availability, but an incorrect subsequent spelling is not [Art. 33.3].

19.2. Justified emendations. A justified emendation replaces the incorrect original spelling and, as a corrected original spelling, retains the authorship and date of the original name [Arts. 32.2.2, 33.2.2, 50.4];

19.3. Multiple original spellings. Alternative original spellings that are not adopted by the First Reviser [Art. 24.2] are deemed to be incorrect original spellings and are not separately available [Art. 32.4].

19.4. Mandatory changes. The availability of a name is not affected by a mandatory change made under the provisions of Article 34.