Title pages

Explanatory Note on the Code

Preface to the Fourth Edition

show sections



show Chapter 1 sections

Chapter 1: Zoological nomenclature

show Chapter 2 sections

Chapter 2: The number of words in the scientific names of animals

show Chapter 3 sections

Chapter 3: Criteria of publication

show Chapter 4 sections

Chapter 4: Criteria of availability

show Chapter 5 sections

Chapter 5: Date of publication

Chapter 6: Validity of names and nomenclatural acts


Article 23. Principle of priority



23.1. Statement of the principle of priority



23.2. Purpose



23.3. Application to synonymy



23.4. Application to homonymy



23.5. Application to spellings



23.6. Application to nomenclatural acts



23.7. Application to collective groups and ichotaxa



23.8. Application to species-group names established on hybrids



23.9. Reversal of precedence



23.10. Erroneous reversal of precedence



23.11. Application of strict priority desired



23.12. Names rejected under former article 23b


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



24.1. Automatic determination of precedence of names



24.2. Determination by the First Reviser

show Chapter 7 sections

Chapter 7: Formation and treatment of names

show Chapter 8 sections

Chapter 8: Family-group nominal taxa and their names

show Chapter 9 sections

Chapter 9: Genus-group nominal taxa and their names

show Chapter 10 sections

Chapter 10: Species-group nominal taxa and their names

show Chapter 11 sections

Chapter 11: Authorship

show Chapter 12 sections

Chapter 12: Homonymy

show Chapter 13 sections

Chapter 13: The type concept in nomenclature

show Chapter 14 sections

Chapter 14: Types in the family group

show Chapter 15 sections

Chapter 15: Types in the genus group

show Chapter 16 sections

Chapter 16: Types in the species group

show Chapter 17 sections

Chapter 17: The International Commission on Zoological Nomenclature

show Chapter 18 sections

Chapter 18: Regulations governing this code




Appendix A: Code of Ethics

Appendix B: General Recommendations

Constitution of the ICZN