halocalculus aciditolerans halocalculus aciditolerans halocalculus aciditolerans is a halophilic archaeon in the family of halobacteriaceae and the only described species in the genus halocalculus (common abbreviation hcl.). halocalculus aciditolerans scientific classification domain: archaea kingdom: euryarchaeota class: halobacteria order: halobacteriales family: halobacteriaceae genus: halocalculus species: h. aciditolerans binomial name halocalculus aciditoleransminegishi et al. 2015