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The family Beijerinckiaceae was circumscribed in 2005 to accommodate four genera of phylogenetically related alphaproteobacteria: Beijerinckia, Chelatococcus, Methylocella and Methylocapsa. Later, four additional genera, i.e. Methylovirgula, Methyloferula, Methylorosula and Camelimonas, were described and assigned to this family, which now accommodates 21 species with validly published names. Members of this family possess strikingly different lifestyles, including chemoheterotrophy, facultative methylotrophy, obligate methanotrophy and facultative methanotrophy. Levels of 16S rRNA gene sequence similarity among most of these bacteria range from 96 to 98 %, suggesting a common evolutionary origin. The genera Chelatococcus and Camelimonas, however, are not monophyletic with the other described genera based on 16S rRNA gene sequence phylogeny, and instead form a distant cluster more closely related to the Methylobacteriaceae. Physiologically these two genera also lack several properties common to the other Beijerinckiaceae. On the other hand, the genus Rhodoblastus, presently considered a member of the Bradyrhizobiaceae, affiliates with high confidence to the Beijerinckiaceae. Here, we propose to transfer the genera Chelatococcus and Camelimonas to the family Chelatococcaceae fam. nov., and present an emended description of the family Beijerinckiaceae, including the genus Rhodoblastus.

Emended description of the family Beijerinckiaceae and transfer of the genera Chelatococcus and Camelimonas to the family Chelatococcaceae fam. nov.