Methylocystis echinoides (ex Gal'chenko et al. 1977) Bowman et al. 1993 Bowman J.P. Sly L.I. Nichols P.D. Hayward A.C. Revised taxonomy of the methanotrophs: Description of Methylobacter gen.nov., emendation of Methylococcus, validation of Methylosinus and Methylocystis species, and a proposal that the family Methylococcaceae includes only the Group I Methanotrophs. 1993 43 4 735 753 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-43-4-735