pseudoxanthobacter pseudoxanthobacter pseudoxanthobacter is a genus of gram-negative, rod-shaped, aerobic and nitrogen-fixing bacteria from the family pseudoxanthobacteraceae. pseudoxanthobacter scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: pseudoxanthobacteraceaehördt et al. 2020 genus: pseudoxanthobacterarun et al. 2008 type species pseudoxanthobacter soli species p. liyangensis p. soli