vibrio pelagius vibrio pelagius vibrio pelagius is a gram negative, oxidase and catalase positive marine bacterium described in 1971. it is commonly found in marine environments and has been isolated from marine sponges of the saint martin's island area of the bay of bengal, bangladesh. colonies are round and whitish, of medium size; individual bacteria have a curved rod shape and are motile. vibrio pelagius scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: vibrionales family: vibrionaceae genus: vibrio species: v. pelagius binomial name vibrio pelagius(baumann et al., 1971) baumann et al., 1981 synonyms beneckea pelagia baumann et al., 1971 listonella pelagia (baumann et al., 1971) macdonell & colwell, 1986