70 International Code of Nomenclature 



Rule 13. Sec. 3. Publication of Names 



RULE 13. The name of a genus or of a subgenus is not validly published 

 unless it is accompanied 



(a) by a description of the genus or subgenus, or 



(b) by citation of a previously and effectively published description of 

 the genus or subgenus, or 



(c) by citation of a previously and effectively published description of 

 the genus as a subgenus or of the subgenus as a genus, or 



(d) in the case of a monotypic new genus based on a new species, by a 

 combined generic and specific description, or 



(e) by a description of one or more species or by citation of a previous 

 and effectively published description of one or more species included 

 in the genus. 



NOTE. A description of a new species assigned to a monotypic new genus 

 is treated also as a generic description if the genus is not described. 

 Similarly a description of a monotypic new genus based on a new species 

 is treated also as a specific description if the generic name and specific 

 epithet are published together and the species is not separately described. 



RECOMMENDATION 13a. A combined generic and specific description 

 should mention the points in which the new genus differs from related 

 genera. 



ANNOTATIONS 



Rule 13 (a) . The publication of the generic name Coryyiebacterium 

 Lehmann and Neumann (Bakt. Diag. 2:390. 1896) included a de- 

 scription of the genus and hence met one criterion for valid publication. 

 The publication of the subgeneric name Sarcinococcus Breed 

 (Bergey's Manual Det. Bad. Ed. 6, p. 285) included a description 

 of the subgenus and thus met one of the criteria for valid publication. 



Rule 13 (b) . The publication of the generic name Rhodosphaera 

 Buchanan {Jour. Bact. 3:472. 1918) included a citation to a de- 

 scription of the genus Rhodococcus Molisch {Die Purpurbakterien 

 p. 20, 1907) , which generic name, though validly published, is an 

 illegitimate later homonym of Rhodococcus Zopf (1891) . The new 

 generic name Rhodosphaera proposed thus met a requirement for 

 valid publication. 



Rule 13 (d). Beijerinck {Cent. Bakt. Abt. 2. 77:593. 1904) published 

 a combined generic and specific description based on the new species 

 Thiobacillus thioparus and thereby met the requirements of valid 

 publication of the generic name. 



