legionella erythra legionella erythra legionella erythra is a gram-negative bacterium from the genus legionella which was isolated from cooling-tower water in seattle. legionella erythra scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. erythra binomial name legionella erythrabrenner et al. 1985 type strain atcc 35303, ccug 29667, cip 103843, dsm 17644, gifu 11748, jcm 7564, nctc 11977, se-32a-c8