According to Keswani et al. (1996), this species is a later heterotypic synonym of Methanococcusmaripaludis Jones et al. 1984.Publication:
Keswani J, Orkand S, Premachandran U, Mandelco L, Franklin MJ, Whitman WB. Phylogeny and taxonomy of mesophilic Methanococcus spp. and comparison of rRNA, DNA hybridization, and phenotypic methods. Int J Syst Bacteriol 1996; 46:727-735.
Methanococcusdeltae is the correct name if this species is regarded as a separate species within a separate genus Methanococcus.