A 16S rRNA sequence analysis revealed that the genera , and are all polyphyletic and should be redefined and reorganized. , the type species of the genus , belongs to a lineage that also contains . The genus is emended so that it contains only these two species, which decompose distinctly crystalline cellulose. and form a lineage which is intermediate between other aerobic species and anaerobic bacteroides. Phenotypically, these organisms are characterized by being facultative anaerobes, inhabiting marine environments, and containing menaquinone-7 and spermidine. We propose that and should be transferred to the genus gen. nov. as comb. nov. and comb. nov., respectively.


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