legionella beliardensis legionella beliardensis legionella beliardensis is a gram-negative, catalase-positive, non-spore-forming, aerobic bacterium from the genus legionella with a single polar flagellum, which was isolated from water from heating apparatus in montbéliard in france. legionella beliardensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: legionellales family: legionellaceae genus: legionella species: l. beliardensis binomial name legionella beliardensislo presti et al. 2001 type strain atcc 700512, ccug 45921, cip 106632, dsm 19152, montbeliard a1