''Cyanobacterium'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

cyanobacteria Cyanobacteria ( ) are a group of autotrophic gram-negative bacteria that can obtain biological energy via oxygenic photosynthesis. The name "cyanobacteria" () refers to their bluish green (cyan) color, which forms the basis of cyanobacteri ...

. Unusual for cyanobacteria, it is published under the

International Code of Nomenclature of Prokaryotes The International Code of Nomenclature of Prokaryotes (ICNP) or Prokaryotic Code, formerly the International Code of Nomenclature of Bacteria (ICNB) or Bacteriological Code (BC), governs the scientific names for Bacteria and Archaea.P. H. A. Sneath ...

(with a living-culture type specimen). It became a validly published name in 2022. It contains one validly-published species, the

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

''Cyanobacterium stanieri''. There is an effectively (but not validly) published "''Cyanobacterium aponinum''" . GTDB splits ''Cyanobacterium stanieri'' into two species-sized clusters and reports three more unnamed species clusters in its understanding of ''Cyanobacterium''. The "''Cyanobacterium aponinum'' PCC 10605" RefSeq genome GCF_000317675.1 is assigned to different genus with a placeholder name, ''PCC-10605'', under GTDB's version of Cyanobacteriaceae. GTDB's version of the Cyanobacteriaceae also includes '' Geminocystis'' and two more placeholder genera.

References

Cyanobacteria genera Chroococcales {{cyanobacteria-stub