Chapter 4: Criteria of Availability

Article 10. Provisions conferring availability

Article 11. Requirements

Article 12. Names published before 1931

Article 13. Names published after 1930

Article 14. Anonymous authorship of names and nomenclatural acts

Article 15. Names and nomenclatural acts published after 1960

Article 16. Names published after 1999

Article 17. Names found to denote more than one taxon, or taxa of hybrid origin, or based on parts or stages of animals or on unusual specimens

Article 18. Inappropriate and tautonymous names

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

Article 20. Genus-group names ending in -ites, -ytes, or -ithes given to fossils