Gracilicutes

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Gracilicutes
Escherichia coli cells magnified 25,000 times
Escherichia coli cells magnified 25,000 times
Scientific classification
Domain: Bacteria
(unranked) Gracilicutes
Kingdoms/Phyla

Proteobacteria
Planctobacteria
Sphingobacteria
Spirochaetae

Gracilicutes is a taxon created by Cavalier-Smith, which he believes to be a clade comprising the Proteobacteria, the Planctobacteria (comprising Chlamydiae and Planctomycetes), the Sphingobacteria (comprising the green sulfur bacteria and Bacteroidetes), and Spirochaetae. It is a Gram-negative clade that branched off from other bacteria just before the evolutionary loss of the outer membrane or capsule, and just after the evolution of flagella.

File:Gracilicutestree.JPG
Cavalier-Smith's version of the tree of life, showing the subgroups of the clade Gracilicutes.

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