There are several models of the Branching order of bacterial phyla, one of these was proposed in 2006 by Ciccarelli ''et al.'' for their iTOL project.
This tree is based on a concatenated set of conserved protein and not 16S rRNA (cf.
Branching order of bacterial phyla (Woese, 1987)).
The arrangement of the various phyla differs from that of 16S, but may be due to
long branch attraction
In phylogenetics, long branch attraction (LBA) is a form of systematic error whereby distantly related lineages are incorrectly inferred to be closely related. LBA arises when the amount of molecular or morphological change accumulated within a lin ...
and due to the limited sampling (many phyla have a sole sequenced representative, whereas the Firmicutes and the Proteobacteria are over-represented). The Proteobacteria is not monophyletic in this phylogram, but this may be erroneous given the large amount of literature in favour of basal Acidobacteria. Contrary to 16S trees, the deepest branching clade is the
Firmicutes
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 ...
. Nevertheless, the last common ancestor was between Bacteria and Archaea+Eukarya.
See also
*
Branching order of bacterial phyla (Woese, 1987)
*
Branching order of bacterial phyla (Rappe and Giovanoni, 2003)
*
Branching order of bacterial phyla after ARB Silva Living Tree
* Branching order of bacterial phyla (Ciccarelli et al., 2006)
*
Branching order of bacterial phyla (Battistuzzi et al.,2004)
*
Branching order of bacterial phyla (Gupta, 2001)
*
Branching order of bacterial phyla (Cavalier-Smith, 2002)
References
{{DEFAULTSORT:Bacterial Phyla
Bacteriology
Systems of bacterial taxonomy