156 International Code of Nomenclature 



Appendix C. Opinions 12, 13. 



OPINION 12 



Conservation of Listeria Pirie 1940 as a 

 Generic Name in Bacteriology 



Listerella Pirie 1927 was proposed as a bacterial generic name. When 

 the attention of the author was called to the fact that Listerella Pirie 

 was a later homonym of the generic name of a myxomycete, he (1940) 

 proposed to replace Listerella by Listeria. This replacement has in 

 general been accepted by those working in medical bacteriology. 

 Becker (1951) noted that Listeria Pirie is a later homonym of Listeria 

 Necker 1790 applied to a genus of flowering plants. Under the rules 

 of the International Code of Nomenclature of Bacteria and Viruses 

 Listeria Pirie is illegitimate. However, the suppression of both Lis- 

 terella and Listeria as bacterial generic names would cause much con- 

 fusion and resentment. 



The generic name Listeria Necker was apparently validly pub- 

 lished to include certain segregates from the genus Oldenlandia in 

 the family Ruhiaceae. The name has not been used by botanists 

 since the time of its introduction (over a period of more than a 

 century and a half) . The Judicial Commission at its meeting on 

 September 4, 1953, agreed to conserve Listeria Pirie 1930 as a generic 

 name in bacteriology and approved the following opinion. 



Opinion 12. 



Listeria Pirie 1940 (type species Listeria monocytogenes (Murray, Webb, 

 and Swann) Pirie 1940) shall be placed in the list of conserved names of 

 bacterial genera (nomine generum conservanda). 



REFERENCES 



Becker, Elery R. The legitimacy of certain generic homonyms in bacteriology 

 and protozoology. Internatl. Bull. Bact. Nomen. and Tax. 1 (3) .103-112. 

 1951. 



Editorial Board. Status of Listeria Pirie 1940 as a generic name in bac- 

 teriology. Preliminary Statement. File 49. Ibid. 3 (2, 3): 109-110. 1953. 



. Status of names of bacterial genera that are later homonyms of names 



of protozoan genera. Preliminary Statement. Ibid. 5 (2. 3) : 109-1 10. 1953. 



Judicial Commission. Opinion 12. Ibid. 4 (3-4): 150. 1954. 



Necker, N. J. Elementa botanica. i:206. 1790. 



Pirie, J. H. H. A new disease of veld rodents, 'Tiger River Disease." Publ. 

 South African Inst. Med. Res. 5:163-186. 1927. 



. The genus Listerella Pirie. Science 97:383. 1940. 



OPINION 13 



Conservation and Rejection of Names of Genera 

 of Bacteria Proposed by Trevisan 1842-1890 



Between the )ear 1842 and 1890 Tre\isan proposed and for the most 

 part validly published at least thirty-three new names for genera and 

 subgenera of the bacteria. Some of these names have been accepted 

 and have come into common use in bacteriology, others for one rea- 



