pontibacter diazotrophicus pontibacter diazotrophicus pontibacter diazotrophicus is a nitrogen-fixing, gram-negative and rod-shaped bacterium from the genus of pontibacter which has been isolated from sand from the taklamakan desert, china. pontibacter diazotrophicus scientific classification domain: bacteria phylum: bacteroidota class: cytophagia order: cytophagales family: hymenobacteraceae genus: pontibacter species: p. diazotrophicus binomial name pontibacter diazotrophicusxu et al. 2014 type strain cctcc ab 2013049, nrrl b-59974, h4x