listeria grandensis listeria grandensis listeria grandensis is a species of bacteria. it is a gram-positive, facultatively anaerobic, non-motile, non-spore-forming bacillus. it is non-pathongenic and non-hemolytic. the species was discovered in and named after grand county, colorado, and its discovery was first published in 2014. listeria grandensis scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: listeriaceae genus: listeria species: l. grandensis binomial name listeria grandensisden bakker et al. 2014 listeria grandensis is phenotypically similar to listeria cornellensis, but l. grandensis shows temperature-dependent acidification of l-rhamnose.