"Rhodospirillum gracile" Hama 1933 Dataset NCBI Taxonomy Classification phylum Pseudomonadota class Alphaproteobacteria order Rhodospirillales family Rhodospirillaceae genus Rhodospirillum species Rhodospirillum rubrum Name Homonyms Rhodospirillum gracile "Rhodospirillum gracile" Hama 1933