A new species, , is proposed for black-pigmented asaccharolytic strains isolated from subgingival plaque samples from dogs with naturally occurring periodontal disease. This bacterium is an obligately anaerobic, nonmotile, non-spore-forming, gram-negative, rod-shaped organism. On laked rabbit blood or sheep blood agar plates, colonies are light brown to greenish brown after 2 to 4 days of incubation and dark brown after 14 days of incubation. Colonies on egg yolk agar and on nonhemolyzed sheep blood agar are orange. The cells do not grow in the presence of 20% bile and have a guanine-plus-cytosine content of 49 to 51 mol%. The type strain is VPB 4878 (= NCTC 12835). The average levels of DNA-DNA hybridization between strains and other members of the genus are as follows: ATCC 33277 (T = type strain), 6.5%; cat strain VPB 3492, 5%; ATCC 35406, 1%; NCTC 11362, 5%; and NCTC 12469, 6%. The level of hybridization between NCTC 12835 DNA and ATCC 25260 DNA is 3%. cells produce major amounts of acetic, propionic, isovaleric, and succinic acids and minor amounts of isobutyric and butyric acids as end products of metabolism in cooked meat medium. The major cellular fatty acid is 13-methyltetradecanoic acid (iso-C). Glutamate and malate dehydrogenases are present, as are glucose-6-phosphate dehydrogenase activity (65.7 nmol mg of protein min) and 6-phosphogluconate dehydrogenase activity (63.0 nmol mg of protein min). cells do not agglutinate sheep erythrocytes but exhibit brick red fluorescence at 265 nm and produce catalase.


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