96 Infernational Code of Nomenclature 



Rule 25. Rejection and Replacement of Names 



Rule 25c. In bacteriology and botany it is the rule that a specific 

 epithet is illegitimate it it exactly repeats the name of the genus (i.e., 

 if it is a tautonym) . When Castellani and Chalmers (1919) decided 

 to make Bacterium alcaligenes Lehmann and Neumann 1899 the 

 type species of a new genus Alcaligenes they were debarred from the 

 use of Alcaligenes alcaligenes and chose A. faecalis. The rule in 

 zoology approves, indeed encourages, the use of specific epithets 

 which are tautonyms. 



