Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980) emend. Brenner et al. 1993 Dataset NCBI Taxonomy Classification phylum Pseudomonadota class Alphaproteobacteria order Rickettsiales Name Homonyms Rickettsiales Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980) emend. Dumler et al. 2001 Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980) emend. Brenner et al. 1993