Eurybacteria is a taxon created by

Cavalier-Smith Thomas (Tom) Cavalier-Smith, FRS, FRSC, NERC Professorial Fellow (21 October 1942 – 19 March 2021), was a professor of evolutionary biology in the Department of Zoology, at the University of Oxford. His research has led to disc ...

, which includes several groups of

Gram-negative Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wa ...

bacteria. In this model, it is the ancestor of

gram positive In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall. Gram-positive bact ...

bacteria. Their

endospores An endospore is a dormancy, dormant, tough, and non-reproductive structure produced by some bacteria in the phylum Bacillota. The name "endospore" is suggestive of a spore or seed-like form (''endo'' means 'within'), but it is not a true spore ...

are characterized by producing and presenting external flagella or mobility by bacterial displacement.

Members

Specifically, it includes: * Fusobacteria. For example, '' Leptotrichia'' and ''

Fusobacterium ''Fusobacterium'' is a genus of anaerobic, Gram-negative, non-sporeforming bacteria belonging to Gracilicutes. Individual cells are slender, rod-shaped bacilli with pointed ends. Strains of ''Fusobacterium'' cause several human diseases, includi ...

'' * Togobacteria. For example, ''

Thermotoga ''Thermotoga'' is a genus of the phylum ''Thermotogota''. Members of ''Thermotoga'' are hyperthermophilic bacteria whose cell is wrapped in a unique sheath-like outer membrane, called a "toga". The members of the phylum stain Gram-negative as th ...

''. In the standard classification, Selenobacteria are usually included in the phylum

Bacillota The Bacillota (synonym Firmicutes) are a phylum of bacteria, most of which have gram-positive cell wall structure. The renaming of phyla such as Firmicutes in 2021 remains controversial among microbiologists, many of whom continue to use the earl ...

, whereas fusobacteria and togobacteria are classified as their own groups.

Relationships

The following graph shows

's version of the tree of life, indicating the status of eurybacteria.

References

{{Taxonbar, from=Q622787 Bacteria by classification Bacteriology