A new genus and species of facultatively methylotrophic bacteria are described. These bacteria are polarly flagellated, gram-negative, nonsporeforming, rod-shaped organisms that occur singly and in pairs. Carotenoid pigment and bacteriochlorophyll are formed in the cells. The deoxyribonucleic acid base composition is 65 to 67 mol% guanine plus cytosine. The cellular fatty acids consist of a large amount of straight-chain unsaturated C acid and small amounts of straight-chain saturated C acid, C cyclopropane acid, and 3-OH-C hydroxy acid. The major ubiquinone is Q-10. Ubiquinones Q-8, Q-9, and Q-11 are present as minor components. A new genus, , is proposed to include this group of methylotropic bacteria. The type species of the genus is comb. nov., with type strain TK 0001 (=DSM 1337 = NCIB 9399).


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