Staphylococcal species can be combined into six species groups and 15 cluster groups. Shown is a summary phylogram adapted from Figure 2 with clades collapsed to represent staphylococcal groupings. Whenever possible, cluster and species group names were kept consistent with . Cluster groups have been color-coded to represent: blue, species that are novobiocin resistant, coagulase negative, and oxidase positive; green, species that are novobiocin susceptible, coagulase negative, and oxidase negative; orange, species that are novobiocin resistant, coagulase negative, and oxidase negative; purple, species that are novobiocin susceptible, coagulase positive, and oxidase negative; and red, species that are novobiocin susceptible, coagulase variable, and oxidase negative. Color scheme exceptions are: #S. schleiferi schleiferi is coagulase negative; *S. simiae is coagulase negative; ‡S. hominis novobiosepticus is novobiocin resistant; and †S. equorum linens is novobiocin susceptible. Members of each cluster group are listed below the cluster group name. Nodes receiving Pp = 1.00 or BS = 100% are indicated by grey-filled circles; otherwise, MrBayes posterior probability is shown in red text, BEST posterior probability is shown in blue text, and ML bootstrap support is shown in black text. Clades that were not present in BEST or ML are indicated by a blue or black §, respectively.