halarchaeum halarchaeum halarchaeum (common abbreviation hla.) is a genus of halophilic archaea in the family of halobacteriaceae. halarchaeum scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: halobacteria order: halobacteriales family: halobacteriaceae genus: halarchaeumminegishi et al. 2010 species h. acidiphilum h. grantii h. nitratireducens h. rubridurum h. salinum h. solikamskense