Deoxyribonucleic acid homology studies of 66 strains formerly classified as subsp. showed two distinct groups with negligible intergroup homology. The larger group, with homology to the type strain of subsp. , is designated , and the description of the taxon is emended. The other deoxyribonucleic acid homology group, which includes strains that differ from in not fermenting sucrose or producing indole, is designated sp. nov.; ATCC 33547 (= VPI 9342) is the type strain. Strains of and do not ferment lactose, as strains of , and do. Strain ATCC 29147 is designated the type strain of sp. nov. This organism is a pigmenting bacteroides whose strains have been isolated from cattle and include the LEV strain (previously called or “ subsp. ”). Phenotypic characteristics useful in differentiating among nine species that formerly have been included in or identified as are listed.


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