gracilibacillus halotolerans gracilibacillus halotolerans gracilibacillus halotolerans is a gram-positive, extremely halotolerant bacteria, the type species of its genus. its type strain is nnt (= dsm 11805t). gracilibacillus halotolerans scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: gracilibacillus species: g. halotoleranswainø et al. 1999 binomial name gracilibacillus halotolerans