Staphylococcus -facultatively anaerobic, gram- positive, usually form irregular clusters, nonmotile catalase positive but oxidase negative, ferment glucose anaerobically. staphylococci staphylococciStaphylococcus - facultatively anaerobic, gram￾positive, usually form irregular clusters, nonmotile, catalase positive but oxidase negative, ferment glucose anaerobically. staphylococci staphylococci