natronobacterium natronobacterium in taxonomy, natronobacterium is a genus of the natrialbaceae. a member of the domain archaea, it is both an extreme halophile and alkaliphile, thriving at an optimum saline concentration of 20% and optimum ph of 10. natronobacterium scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: halobacteria order: natrialbales family: natrialbaceae genus: natronobacteriumtindall et al. 1984 emend. tindall 2001 species n. gregoryi n. texcoconense synonyms natronobacteria taxonomy as of 2022, there are 2 species described in this genus. proposed species natronobacterium chahanensis and natronobacterium innemongoliae are proposed names for strains isolated from soda lakes in china. as of 2022, the descriptions from 1989 (n. chahanensis) and 1997 (n. innemongoliae) are not validly published. species formerly placed in this taxon. natronobacterium magadii, now natrialba magadii natronobacterium nitratireducens, now halobiforma nitratireducens natronobacterium pharaonis, now natronomonas pharaonis natronobacterium vacuolatum, now halorubrum vacuolatum