gracilibacillus gracilibacillus gracilibacillus is a genus of bacteria within the phylum bacillota. species within this genus are generally halotolerant. gracilibacillus scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: gracilibacilluswainø et al. 1999 type species gracilibacillus halotolerans species g. alcaliphilus g. boraciitolerans g. bigeumensis g. dipsosauri g. halophilus g. halotolerans g. kekensis g. lacisalsi g. massiliensis g. orientalis g. quinghaiensis g. saliphilus g. thailandensis g. ureilyticus