Hybridization experiments were carried out between DNAs from more than 70 strains of spp. and related taxa and either H-labeled 23S rRNAs from reference strains belonging to , and , an unnamed sp. strain, and a strain or H- or C-labeled 23S rRNAs from 13 gram-negative reference strains. An immunotyping analysis of 130 antigens versus 34 antisera of campylobacters and related taxa was also performed. We found that all of the named campylobacters and related taxa belong to the same phylogenetic group, which we name rRNA superfamily VI and which is far removed from the gram-negative bacteria allocated to the five rRNA superfamilies sensu De Ley. There is a high degree of heterogeneity within this rRNA superfamily. Organisms belonging to rRNA superfamily VI should be reclassified in several genera. We propose that the emended genus should be limited to , and and are transferred to the genus as comb. nov. and rectus comb. nov., respectively. and are generically misnamed and are closely related to the genus , and an unnamed sp. strain constitute a new genus, for which the name is proposed; this genus contains two species, comb. nov. (type species) and comb. nov. so far is the only species of the genus . The genus is also emended; and are included in this genus as comb. nov. and comb. nov., respectively. The genus with as the only species, is closely related to the genus . The free-living, sulfur-reducing campylobacters do not belong to any of these genera; they probably constitute a distinct genus within rRNA superfamily VI.


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