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SUMMARY Species of the genus Staphylococcus have a guanine + cytosine (GC) content in DNA within the range 30.7-36.4 moles yo. All the Gram-positive cocci so far designated as micrococci and sarcinas which produce acid from glucose when grown under anaerobic or aerobic conditions and have a GC content in DNA within this range should be also classified as Staphylococcus. On the other hand species of the genus Micrococcus have a GC content in DNA within the range 66*3-73*3y0. All the Gram-positive cocci hitherto designated as sarcinas and staphylococci which do not produce acid from glucose under aerobic or anaerobic conditions or only aerobically and which have a GC content in DNA within this range, should be also classified as Micrococcus. The range of GC content as outlined is approximate; it will be made more accurate (perhaps a little broader) when more data are available on the DNA base composition of the species belonging to the family Micrococcaceae. On the basis of their DNA base composition the strains belonging to the genus Micrococcus are divided into three groups: group 1 (70.8- 73-3 moles yo GC); group 2 (67-5-69.5 moles yo GC); group 3 (66.3- 67-0 moles yo GC). Similarly the strains belonging to the genus Staphylo- coccus have been divided into three groups: group 5 (36.4 moles yo GC); group 6 (33-3-34.2 moles GC); group 7 (30.7-32-7 moles % GC). Strains within each group are believed to be phylogenetically related. When subjected to Adansonian analysis, the strains of the individual groups were clustered into subgroups. Each subgroup comprised the strains with approximately the same DNA base composition and a high yo similarity of physiological and biochemical characters. Strains clustered into subgroups are believed to be genetically closely related, some may be identical. The following subgroups are suggested : micrococcus subgroups 1 a, 1 b, 2 a, 2 b, 2c, 3a, 3b; staphylococcus subgroups 5a, 6a, 7a. Arabic numerals refer to the designation of the group. The classification of micrococci presented in this paper is substantially the same as that of Baird-Parker (1965). The authors are of the same opinion as Baird-Parker (1965) that Micrococcus denitrijcans should be reclassified with the Gram-negative genera.

The Classification of Micrococci and Staphylococci Based on their DNA Base Composition and Adansonian Analysis