"Spirillum kriegii" Podkopaeva et al. 2006 Dataset NCBI Taxonomy Classification phylum Pseudomonadota class Betaproteobacteria order Nitrosomonadales family Spirillaceae genus Spirillum species Spirillum kriegii Name Homonyms Spirillum kriegii "Spirillum kriegii" Podkopaeva et al. 2006