oceanisphaera oceanisphaera oceanisphaera is a gram-negative and non-spore-forming genus of bacteria from the family of aeromonadaceae. oceanisphaera scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: aeromonadales family: aeromonadaceae genus: oceanisphaeraromanenko et al. 2003 type species oceanisphaera litoralis species o. arctica o. aquimarina o. avium o. donghaensis o. litoralis o. marina o. ostreae o. profunda o. psychrotolerans o. sediminis