devosia neptuniae devosia neptuniae devosia neptuniae is a nitrogen-fixing bacteria that nodulates neptunia natans. it is gram-negative, strictly aerobic short rod-shaped and motile by a subpolar flagellum. the type strain of d. neptuniae is lmg 21357t (cect 5650t). devosia neptuniae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: devosiaceae genus: devosia species: d. neptuniae binomial name devosia neptuniaerivas et al. 2003