"Spirillum gracile" Canale-Parola et al. 1966 Dataset NCBI Taxonomy Classification phylum Pseudomonadota class Betaproteobacteria order Burkholderiales family Comamonadaceae genus Hylemonella species Hylemonella gracilis Name Homonyms Spirillum gracile "Spirillum gracile" Canale-Parola et al. 1966