Caedibacter caryophila (sic) Schmidt et al. 1987 Caedibacter caryophilus corrig. Schmidt et al. 1987 Springer N. Ludwig W. Amann R. Schmidt H.J. Görtz H.D. Schleifer K.H. Occurrence of fragmented 16S rRNA in an obligate bacterial endosymbiont of Paramecium caudatum 1993 90 9892 9895 Proceedings of the National Academy of Sciences of the United States of America Proc Natl Acad Sci U S A 0027-8424 1091-6490 8234331 Schmidt H.J. Görtz H.D. Quackenbush R.L. Caedibacter caryophila sp. nov., a killer symbiont inhabiting in the macronucleus of Paramecium caudatum 1987 37 4 459 462 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-37-4-459 This strain is 221 carried in Paramecium caudatum C221 (ATCC 50168).