Bacterium (genus)


The genus ''Bacterium'' was a taxon described in 1828 by
Christian Gottfried Ehrenberg Christian Gottfried Ehrenberg (19 April 1795 – 27 June 1876), German German(s) may refer to: Common uses * of or related to Germany * Germans, Germanic ethnic group, citizens of Germany or people of German ancestry * For citizens of Germany, ...

Christian Gottfried Ehrenberg
. The type species was later changed from ''Bacterium triloculare'' to ''Bacterium coli'' (now ''
Escherichia coli ''Escherichia coli'' (),Wells, J. C. (2000) Longman Pronunciation Dictionary. Harlow ngland Pearson Education Ltd. also known as ''E. coli'' (), is a Gram-negative bacteria, Gram-negative, Facultative anaerobic organism, facultative anaer ...

Escherichia coli
'') as it was lost. In 1951 and then in 1954 it was recognised as a ''nomen generum rejiciendum'', which means a generic name to be rejected; this also applied to its family ''Bacteriaceae''. This genus included non-spore forming rods whose relation to other species was obscure (a " taxonomy dumping group"). This is different from the genus
Bacillus ''Bacillus'' (Latin "stick") is a genus Genus /ˈdʒiː.nəs/ (plural genera /ˈdʒen.ər.ə/) is a taxonomic rank In biological classification In biology, taxonomy () is the scientific study of naming, defining (Circumscription (t ...

, whose members were spore forming rods (''sensu'' Cohn 1872COHN (F.): Untersuchungen über Bakterien. Beitrage zur Biologie der Pflanzen Heft 2, 1872, 1, 127-224.).


Many species were placed under the genus. Given that the genus was abolished in the process of forming the Bacteriological Code there is no such thing as an official list of species present. These are those accepted by Breed and Conn in 1935: * ''Bacterium radiobacter'', then ''Agrobacterium tumefaciens'', now ''
Rhizobium radiobacter ''Agrobacterium tumefaciens'' (updated scientific name ''Rhizobium radiobacter'', synonym ''Agrobacterium radiobacter'') is the causal agent of crown gall disease (the formation of tumours) in over 140 species of eudicots. It is a rod-shaped, Gra ...
'' * ''Bacterium aerogenes'', now '' Aerobacter aerogenes'' * ''Bacterium violaceum'', now ''
Chromobacterium violaceum ''Chromobacterium violaceum'' is a Gram-negative Gram-negative bacteria are bacteria Bacteria (; common noun bacteria, singular bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biologic ...
'' * ''Bacterium amylovorum'', now ''
Erwinia amylovora Fire blight, also written fireblight, is a contagious disease affecting apples, pears, and some other members of the family Rosaceae. It is a serious concern to apple and pear producers. Under optimal conditions, it can destroy an entire orchard ...
'' * ''Bacterium zopfii'', now '' Kurthia zopfii'' * ''Bacterium monocytogenes'', now ''Listeria monocytogenes'' * ''Bacterium pneumoniae'', now ''Klebsiella pneumoniae''

See also

* Bacteria * Bacterial taxonomy


{{reflist Obsolete bacteria taxa Taxa named by Christian Gottfried Ehrenberg