1887

Abstract

The class in the phylum includes a very heterogeneous assemblage of bacteria. Their evolutionary relationships are not well established; revisions of their phylogenetic placements based on comparative studies of 16S rRNA gene sequences are in progress as genome sequence information accumulates. In this work, phylogenetic trees were reconstructed based on 21 concatenated ribosomal protein sequences using Bayesian and maximum-likelihood methods. Both trees consistently indicate that the is a deeply branching order among the class . The rest of the species are grouped into 10 monophyletic clusters, most of which are comprised of two or three orders and families according to the current taxonomy. The maximum-likelihood tree placed and in the class in accordance with the current taxonomy, in which these two bacteria are assigned to the family . However, the Bayesian tree placed these two bacteria at the boundary between the and . A gene arrangement that is present uniquely in the species was identified. Both and do not have this arrangement characteristic of the . On the basis of the Bayesian tree and gene arrangement comparison, it is suggested that and should be placed outside the phylum .

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2015-11-01
2019-10-19
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