SUMMARY: A numerical taxonomic study of 64 strains of anaerobic Gram-negative bacilli isolated from men with non-gonococcal urethritis, two unclassified laboratory strains of “corroding bacilli”, and 12 other strains of anaerobic Gram-negative bacilli, including nine received as anaerobic curved rods and three as “” (), isolated from women with bacterial vaginosis, was undertaken. Seventeen reference anaerobic strains belonging to the genera and were included. Morphological, biochemical and physiological characteristics were examined in 103 tests. The resemblance between the 95 strains was calculated using the and coefficients for cluster analyses based on the UPGMA method. All three approaches gave similar groupings, and the estimated average probability of test error was 2.46%. The strains fell into 10 phenons. The unclassified strains from men and three from women with lower genital-tract infections, and the laboratory strains of “corroding bacilli” clustered in one phenon with the reference strains of , indicating that they correspond to The other unclassified strains of anaerobic curved rods clustered as a distinct phenon. They correspond to species of the newly described genus The taxonomic data and the compilation of diagnostic tables serve as a useful guide for the laboratory identification of clinical isolates regarded as


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