planctobacterium planctobacterium planctobacterium is a gram-negative, aerobic and motile bacteria genus from the family of alteromonadaceae with one known species (planctobacterium marinum). planctobacterium marinum has been isolated from the south china sea. planctobacterium scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: alteromonadales family: alteromonadaceae genus: planctobacteriumsheu et al. 2017 type species planctobacterium marinum species p. marinum