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_Porphyrobacter mercurialis_ (mer.cur.ia.al'is L. adj. _mercurialis_, temperamental in reference to difficulties in establishing consistent growth requirements during characterization).  Gram-negative, non-spore forming pleomorphic bacteria. Strictly aerobic and chemoheterotrophic. Contains carotenoids, but not bacteriochlorophyll _a_. The major respiratory quinone is ubiquinone 10, the dominant phospholipds are phosphatidylglycerol, sphingoglycolipid, and phophatidylthanolamine. Colonies on LB are round, glossy, and less than 1 mm in diameter. Coloration on agar and in dense liquid culture is dark yellowish orange, appears lighter yellow in liquid culture during exponential phase. Morphology is non-motile pleomorphic ovals or short rods (average 1.6um length), often with pointed ends. Growth in liquid culture from 4-28°C, optimum growth at 25°C. Requires salt for growth, optimal growth at 0.5% NaCl, cannot grow at 3% NaCl. Tolerates up to pH 8.0, optimum around neutral pH. Oxidase-negative and catalase-positive. catalase-positive, does not hydrolyze casein or starch.  Does not grow on R2A agar. The primary fatty acids are C18:1\(\omega\)7cis and C16:0, with a high percentage of the latter relative to other species in the _Erythrobacteraceae_ family. Can utilize the following as sole carbon sources: Glycyl-L-Glutamic Acid, L-Rhamnose, D-Mannose, D-Trehalose, a-D-Glucose, L-Fucose, D-Galactose, Citric acid, D-Glucuronic acid, D-Galactonic acid, L-Galactonic acid-\(\gamma\)-Lactone, Acetoacetic acid, Acetic acid, Pyruvic acid, and L-Malic acid. The type strain Coronado(T) (=DSMZ 29971, =LMG 28700) was isolated from a stadium seat in Coronado, CA. The GC content of the type strain is 67.3%, as determined by genome sequencing. The genome size is approximately 3.5MB.