staphylococcus massiliensis staphylococcus massiliensis staphylococcus massiliensis is a gram-positive, coagulase-negative member of the bacterial genus staphylococcus consisting of clustered cocci. strains of this species were first isolated from a human brain abscess and were found to be most closely related to staphylococcus piscifermentans, staphylococcus condimenti, staphylococcus carnosus subsp. carnosus, staphylococcus carnosus subsp. utilis, and staphylococcus simulans. a subsequent study found that s. massiliensis may actually be part of the human skin microbiome and may have been a contaminant of brain abscess-derived samples. staphylococcus massiliensis scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: staphylococcaceae genus: staphylococcus species: s. massiliensis binomial name staphylococcus massiliensisal masalma, raoult, and roux 2010