Eurybacteria

This article is about a proposed taxon not accepted by the majority of the scientific community. For more accepted classification, see Bacterial phyla.

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.

Members

Specifically, it includes:

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

Relationships

The following graph shows Cavalier-Smith's version of the tree of life, indicating the status of eurybacteria.[3]

 [A] 

Chlorobacteria


 [B] 

Hadobacteria


 [C] 
 [D] 

Cyanobacteria


 [E] 
 [F] 

Gracilicutes


 [G] 

Eurybacteria


 [H] [I] 

Endobacteria


 [J] 

Actinobacteria


 [K] Neomura  
 [L] 

Archaea


 [M] 

Eukarya










Legend: [A] Gram-negative with a peptidoglycan cell wall like Chlorosomee. [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, sortasa 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.

References

  1. Cavalier-Smith T (2006). "Rooting the tree of life by transition analyses". Biol. Direct 1 (1): 19. doi:10.1186/1745-6150-1-19. PMC 1586193. PMID 16834776.
  2. Cavalier-Smith T (January 2010). "Deep phylogeny, ancestral groups and the four ages of life". Philos. Trans. R. Soc. Lond., B, Biol. Sci. 365 (1537): 111–32. doi:10.1098/rstb.2009.0161. PMC 2842702. PMID 20008390.
  3. Cavalier-Smith T (2006). "Cell evolution and Earth history: stasis and revolution" (PDF). Philos Trans R Soc Lond B Biol Sci 361 (1470): 969–1006. doi:10.1098/rstb.2006.1842. PMC 1578732. PMID 16754610.
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