legionella tunisiensis legionella tunisiensis legionella tunisiensis is a gram-negative bacterium from the genus legionella isolated from hypersaline lake water from the lake sabkha in tunisia. legionella tunisiensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. tunisiensis binomial name legionella tunisiensiscampocasso et al. 2012 type strain csur p145, dsm 24805, legm