stenotrophomonas humi stenotrophomonas humi stenotrophomonas humi is a nitrate-reducing, gram-negative, rod-shaped and non-spore-forming bacterium from the genus of stenotrophomonas which has been isolated from soil from ghent in belgium. stenotrophomonas humi scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: xanthomonadales family: xanthomonadaceae genus: stenotrophomonas species: s. humi binomial name stenotrophomonas humiheylen et al. 2007 type strain dsm 18929, lmg 23959, strain r-32729