Candidatus Legionella jeonii

"Candidatus" Legionella jeonii is a "candidatus" species of bacteria from the genus "Legionella". Previously known as X-bacterium"', "Candidatus" Legionella jeonii grows symbiotically in "Amoeba proteus". This endosymbiotic relationship was first noticed by Kwang Jeon and Joan Lorch in 1966.
A more recent reference dropped "Candidatus" from its name.