RT Journal Article SR Electronic(1) A1 Tindall, B. J.YR 2019 T1 Rule 24b of the International Code of Nomenclature of Prokaryotes and regulating the priority of names and epithets considered to be associated with heterotypic synonyms JF International Journal of Systematic and Evolutionary Microbiology, VO 69 IS 12 SP 3980 OP 3983 DO https://doi.org/10.1099/ijsem.0.003531 PB Microbiology Society, SN 1466-5034, AB Rule 24b of the International Code of Nomenclature of Prokaryotes regulates the priority of names that are considered to be heterotypic synonyms. However, the rule is imperfect because it caters only for names that compete for priority that were only included on the Approved Lists of Bacterial Names or for names that were only validly published in the International Journal of Systematic Bacteriology or the International Journal of Systematic and Evolutionary Microbiology, either in an original article or via the Validation Lists. Although this should be self-explanatory, Rule 24b does not cater for what happens when one or more names considered to be heterotypic synonyms have appeared on the Approved Lists of Bacterial Names while other names also considered to be heterotypic synonyms were validly published in the International Journal of Systematic Bacteriology or the International Journal of Systematic and Evolutionary Microbiology, either in an original article or via the Validation Lists. Formal changes to the International Code of Nomenclature of Prokaryotes are required., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.003531