A systematic phylogenetic analysis of the genus was performed. The 16S rRNA gene sequences of 13 species, an unnamed strain (ATCC 49338), and an -like isolate from sea mammals were determined. Comparative sequence analysis with closely related taxa revealed phylogenetic diversity and internal structure within the genus . In addition, some members of other genera (viz., the genera , and ) were shown to be phylogenetically intermixed with the species. It was evident from both distance and tree topology considerations that the genus is in urgent need of taxonomic revision and requires subdivision into several genera. Based on the results of the present study it is proposed that and be assigned to the genus as comb. nov. and comb. nov., respectively. In addition, a new species, , is proposed for -like bacteria isolated from seals.


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