listeria newyorkensis listeria newyorkensis listeria newyorkensis 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. it was discovered in a seafood processing plant in new york, and was first published in 2015. listeria newyorkensis scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: listeriaceae genus: listeria species: l. newyorkensis binomial name listeria newyorkensisweller et al. 2015 listeria newyorkensis "(c)an be differentiated from other species of the genus listeria by the absence of the α-mannosidase reaction, inability to acidify d-arabitol, and ability to acidify d-ribose, d-galactose and l-arabinose."