listonella listonella listonella is a genus of gram-negative marine bacteria in the family vibrionaceae named after the american microbiologist j. liston. analysis of phylogenetic, genomic and phenotypic data has shown the genus is not distinct from the genus vibrio, so it is now considered a synonym of vibrio. listonella scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: vibrionales family: vibrionaceae genus: listonellamacdonell and colwell 1986 type species listonella anguillarum species l. anguillarum l. pelagia