Spectririckettsia obscura Castelli et al. 2019 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Proteobacteria (sic) Garrity et al. 2021 Pseudomonadota corrig. Garrity et al. 2021 Alphaproteobacteriota (sic) Garrity et al. 2021 Alphaproteobacteria Garrity et al. 2006 Rickettsiales Gieszczykiewicz 1939 (Approved Lists 1980) emend. Dumler et al. 2001 Rickettsiaceae Pinkerton 1936 (Approved Lists 1980) emend. Dumler et al. 2001 Spectririckettsia Castelli et al. 2019 Spectririckettsia obscura Castelli et al. 2019 Spectririckettsia Castelli et al. 2019 Spectririckettsia obscura Castelli et al. 2019 Castelli M. Serra V. Senra M.V.X. Basuri C.K. Soares C.A.G. Fokin S.I. Modeo L. Petroni G. The Hidden World of Rickettsiales Symbionts: "Candidatus Spectririckettsia obscura," a Novel Bacterium Found in Brazilian and Indian Paramecium caudatum. 2019 77 3 748 758 Microbial Ecology Microb Ecol 0095-3628 1432-184X 10.1007/s00248-018-1243-8 30105505 Castelli M. Serra V. Senra M.V.X. Basuri C.K. Soares C.A.G. Fokin S.I. Modeo L. Petroni G. The Hidden World of Rickettsiales Symbionts: "Candidatus Spectririckettsia obscura," a Novel Bacterium Found in Brazilian and Indian Paramecium caudatum. 2019 77 3 748 758 Microbial Ecology Microb Ecol 0095-3628 1432-184X 10.1007/s00248-018-1243-8 30105505