neptuniibacter caesariensis neptuniibacter caesariensis neptuniibacter caesariensis is a gram-negative, strictly aerobic, slightly halophilic and motile bacterium from the genus of neptuniibacter which has been isolated from water from the mediterranean sea. neptuniibacter caesariensis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: oceanospirillales family: oceanospirillaceae genus: neptuniibacter species: n. caesariensis binomial name neptuniibacter caesariensisarahal et al. 2007 type strain ccug 52065, cect 7075, cip 109617, med92