halosimplex halosimplex in taxonomy, halosimplex is a genus of the halobacteriaceae. halosimplex scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: halobacteria order: halobacteriales family: haloarculaceae genus: halosimplex vreeland et al. 2003 species h. carlsbadense h. halophilum h. litoreum h. pelagicum h. rubrum h. salinum