staphylococcaceae staphylococcaceae the staphylococcaceae are a family of gram-positive bacteria that includes the genus staphylococcus, noted for encompassing several medically significant pathogens. staphylococcaceae staphylococcus aureus scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: staphylococcaceaeschleifer and bell 2010 genera abyssicoccus aliicoccus auricoccus corticicoccus gemella jeotgalicoccus macrococcus nosocomiicoccus salinicoccus staphylococcus the five genera jeotgalicoccus, macrococcus, nosocomiicoccus, salinicoccus, and staphylococcus have been shown to be monophyletic, while gemella appears to be polyphyletic. the pathogen methicillin-resistant staphylococcus aureus is a member of this family.