Methanohalophilusoregonensis is the correct name if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Methanohalophilus.
The original spelling of the specific epithet, oregonense (sic), has been corrected by Boone et al. 1993.Publication:
Boone DR, Mathrani IM, Liu Y, Menaia JAGF, Mah RA, Boone JE. Isolation and characterization of Methanohalophilus portucalensis sp. nov. and DNA reassociation study of the genus Methanohalophilus. Int. J. Syst. Bacteriol. 1993; 43:430-437.