Abstract
The asaccharolytic and saccharolytic strains at present classified together in one species, Bacteroides melaninogenicus, have been shown to differ in a number of properties including their deoxyribonucleic acid base ratios. It is proposed that the asaccharolytic strains (guanine-plus-cytosine content, 50 to 54 mol%) should be assigned to a separate species, Bacteroides asaccharolyticus, whereas the saccharolytic strains (guanine-plus-cytosine content, 40 to 45 mol%) should still be classified in the two subspecies Bacteroides melaninogenicus subsp. melaninogenicus and Bacteroides melaninogenicus subsp. intermedius, although further study is required to complete the characterization of these two groups.
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