listeria fleischmannii listeria fleischmannii listeria fleischmannii is a species of bacteria. it is a gram-positive, facultatively anaerobic, non-motile, non-spore-forming bacillus. it is non-pathogenic and non-hemolytic. the species was first isolated in 2006 in switzerland from hard cheese. the species is named after wilhelm fleischmann, a pioneer in the research of dairy products. listeria fleischmannii scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: listeriaceae genus: listeria species: l. fleischmannii binomial name listeria fleischmanniibertsch et al. 2013 listeria fleischmannii can be differentiated from other species of listeria by its ability to ferment both d-mannitol and d-xylose.