oenococcus oenococcus oenococcus is a genus of gram-positive bacteria, placed within the family lactobacillaceae. the only species in the genus was oenococcus oeni (which was known as leuconostoc oeni until 1995). in 2006, the species oenococcus kitaharae was identified. as its name implies, oenococcus oeni holds major importance in the field of oenology, where it is the primary bacterium involved in completing malolactic fermentation. oenococcus scientific classification domain: bacteria phylum: bacillota class: bacilli order: lactobacillales family: lactobacillaceae genus: oenococcusdicks et al. 1995 type species oenococcus oeni(garvie 1967) dicks et al. 1995 species oenococcus alcoholitolerans badotti et al. 2015 "candidatus oenococcus aquikefiri" verce et al. 2019 oenococcus kitaharae endo and okada 2006 oenococcus oeni (garvie 1967) dicks et al. 1995 "oenococcus sicerae" cousin et al. 2019