marinospirillum megaterium marinospirillum megaterium marinospirillum megaterium is a helical, halophilic and gram-negative bacterium from the genus of marinospirillum which has been isolated from fermented brine. marinospirillum megaterium scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: oceanospirillales family: oceanospirillaceae genus: marinospirillum species: m. megaterium binomial name marinospirillum megateriumsatomi et al. 1998 type strain cip 106459, jcm 10129, strain h7