listeria riparia listeria riparia listeria riparia is a species of bacteria. it is a gram-positive, facultatively anaerobic, non-motile, non-spore-forming bacillus. it is non-pathongenic. its name refers to the riparian zone, and its discovery was first published in 2014. listeria riparia scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: listeriaceae genus: listeria species: l. riparia binomial name listeria ripariaden bakker et al. 2014 listeria riparia "(c)an be differentiated from other non-motile species of the genus listeria by a combination of α-mannosidase activity and the ability to acidify l-rhamnose, d-galactose and l-arabinose."