, a new species from periodontal pockets and superficially cleaned tooth surfaces coronal to gingival margins and from various types of human infections, is described. Strains of are obligately anaerobic, gram-negative, usually pigmenting, nonmotile, nonsporeforming rods that do not grow well in 10% bile and that ferment carbohydrates. These strains previously were identified as or , but they have no deoxyribonucleic acid homology with the type strain of either of these two species. The type strain of is ATCC 15930. The descriptions of and are emended.


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