halorhabdus tiamatea halorhabdus tiamatea halorhabdus tiamatea is a halophilic archaeon isolated from the red sea. with its extremely high salinity optimum of 27% nacl, halorhabdus has one of the highest reported salinity optima of any living organism. halorhabdus tiamatea scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: halobacteria order: halobacteriales family: haloarculaceae genus: halorhabdus species: h. tiamatea binomial name halorhabdus tiamateaantunes et al. 2008 genome structure the genome of halorhabdus was sequenced in august 2014. the g + c content of its dna is estimated to be 64%.