sp. nov. and sp. nov. are described. These organisms are short, gram-positive, strictly anaerobic, rod-shaped bacteria that have DNA G+C contents of 53 and 45 mol%, respectively, produce major amounts of lactic acid, and have been isolated from human gingival crevices and periodontal pockets. The major cellular fatty acid derivatives for both species are C -9 fatty acid methyl ester and C -9 dimethylacetyl. The type strain of is strain VPI D76D-27C (= ATCC 49627), and the type strain of is strain D140H-11A (= ATCC 49626). Emended descriptions of (based on selected strains) and (based on many additional strains) also are given.


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