Eurybacteria

Eurybacteria is a taxon created by Cavalier-Smith,^[1] which includes several groups of Gram-negative bacteria. In this model, it is the ancestor of gram positive bacteria.^[2] Their endospores are characterized by producing and presenting external flagella or mobility by bacterial displacement.

Specifically, it includes:

• Fusobacteria. For example, Leptotrichia and Fusobacterium
• Togobacteria. For example, Thermotoga.

In the standard classification, Selenobacteria are usually included in the phylum Bacillota, whereas fusobacteria and togobacteria are classified as their own groups.

The following graph shows Cavalier-Smith's version of the tree of life, indicating the status of eurybacteria. Cavalier-Smith's Tree of Life, 2006^{[cstol 1]}

Legend:
[A] Gram-negative with a peptidoglycan cell wall like Chlorosome.
[B] Oxygenic Photosynthesis, Omp85 and four new catalases.
[C] Glycobacterial revolution: outer membrane with insertion of lipopolysaccharides, hopanoids, diaminopimelic acid, ToIC and TonB.
[D] Phycobilin chromophores.
[E] Flagella.
[F] Four sections: an amino acid in HSP60 and FtsZ and a domain in RNA polymerases β and σ.
[G] Endospores.
[H] Gram-positive Bacteria: hypertrophy of the wall peptidoglycan, sortase enzyme and a loss of the outer membrane.
[I] Glycerol 1-P dehydrogenase.
[J] Proteasome and phosphatidylinositol.
[K] Neomura revolution: Replacement of peptidoglycan by glycoproteins and lipoproteins.
[L] Reverse DNA gyrase and ether lipid isoprenoids.
[M] Phagocytosis.