halorubrum vacuolatum halorubrum vacuolatum halorubrum vacuolatum is a halophilic archaeon in the family of halorubraceae. it is an extremophile and is able to survive in water with high salt concentration. halorubrum vacuolatum scientific classification domain: archaea kingdom: euryarchaeota class: halobacteria order: haloferacales family: halorubraceae genus: halorubrum species: h. vacuolatum binomial name halorubrum vacuolatum(mwatha and grant 1993) kamekura et al. 1997 synonyms natronobacterium vacuolatum mwatha and grant 1993 natronobacterium vacuolata (spelling variant)