The taxonomic positions of several recently described species, , and , were investigated by numerical analysis. A set of 141 strains, for which a total of 240 characters was recorded, was analyzed and also compared with representatives of a set of 384 strains of bacteria, examined in an earlier study, representing genera within the family Three clusters of spp. were observed, spp., and , with strains received as and clustering with the spp. was concluded to be synonymous with , from the results of this study, was included in the species Hydrogen sulfide-positive strains of were not judged to warrant separate species status. , and were found to be highly related (similarity values > 90%). It is proposed that these species be merged into a single species,


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