psychrobacillus psychrobacillus psychrobacillus is a genus of bacteria from the family of bacillaceae. pseudogracilibacillus scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: psychrobacilluskrishnamurthi et al. 2011 type species psychrobacillus insolitus species p. insolitus p. psychrodurans p. psychrotolerans p. soli