oceanisphaera ostreae oceanisphaera ostreae oceanisphaera ostreae is a gram-negative, non-spore-forming and motile bacterium from the genus of oceanisphaera which has been isolated from seawater from an oyster farm from the south sea in korea. oceanisphaera ostreae scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: aeromonadales family: aeromonadaceae genus: oceanisphaera species: o. ostreae binomial name oceanisphaera ostreaechoi et al. 2011 type strain ccug 60525, kctc 23422, strain t-w6 synonyms oceanisphaera ostrea