rickettsia massiliae rickettsia massiliae rickettsia massiliae is a tick-borne pathogenic spotted fever group rickettsia species. rickettsia massiliae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: rickettsiales family: rickettsiaceae genus: rickettsia species group: spotted fever group species: r. massiliae binomial name rickettsia massiliaebeati and raoult 1993