The present definition of the genus excludes organisms which do not utilize methane facultatively. However, reports have indicated that cultures of the type strain of the type species, , can lose this feature easily. Furthermore, studies have shown that is phenotypically highly similar to the methane-nonutilizing, pink-pigmented, facultatively methylotrophic bacteria and that the latter should be excluded from the various genera to which they have been assigned previously. Therefore, in accordance with an earlier suggestion, we propose that the description of the genus be emended to permit the inclusion of methane-nonutilizing organisms which are otherwise highly similar to the type species. We further propose that all of the pink-pigmented, facultatively methylotrophic bacteria, which include the species , and , be transferred to the genus .


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