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FlectobacillusRANK: GenusTAXONOMY: Bacteria -> Bacteroidetes/Chlorobi group -> Bacteroidetes -> Cytophagia -> Cytophagales -> Cytophagaceae -> Flectobacillus OVERVIEW: Curved, nonflexible rods with variable degrees of curvature from cell to cell. Most cells of Flectobacillus major are shaped like the letter C (wide-open rings), and sometimes cell ends touch or overlap (closed rings). Coils are less common, and spiral forms are rare. The outer ring diameter is 5–10 µm, and the cell width is 0.6–2.0 µm. The ends of the cells are tapered or rounded or both. Cells of Flectobacillus lacus are almost straight rods. Gram-stain-negative. Nonflagellated and nonmotile. Colonies are 2–6 mm in diameter with a pale pink or rose-color due to a water-insoluble pigment. No growth occurs in media containing seawater or 3.0% NaCl. Aerobic, having a strictly respiratory type of metabolism with oxygen as the terminal electron acceptor. Oxidase-positive. Chemo-organotrophic but not methylotrophic. The natural habitats are freshwater lakes and eutrophic ponds.DNA G+C content (mol%): 38.3–40.3. Type species: Flectobacillus major |