haloferax alexandrinus haloferax alexandrinus haloferax alexandrinus is a species of archaea in the family haloferacaceae. haloferax alexandrinus scientific classification domain: archaea kingdom: euryarchaeota class: halobacteria order: haloferacales family: haloferacaceae genus: haloferax species: h. alexandrinus binomial name haloferax alexandrinus(asker ohta 2002)