legionella londiniensis legionella londiniensis legionella londiniensis is a gram-negative bacterium from the genus legionella which was isolated from hot spring water in shizuoka in japan. legionella londiniensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. londiniensis binomial name legionella londiniensisdennis et al. 1993 type strain atcc 49505, ccug 44895, cip 105269, nctc 12374, thacker 1477