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Phylum Actinobacteria, Class Actinobacteria , Subclass Actibacteridae, Order Actynomycetales, Suborder Corynebacterinae, Family
Corynebacteriaceae, Genus Corynebacterium,
Corynebacterium variabile corrig. (Müller 1961) Collins 1987.

Synonyms:
Arthrobacter variabilis Müller 1961;
Corynebacterium variabile corrig. (Müller 1961) Collins 1987 is an earlier heterotypic synonym of
Corynebacterium mooreparkense
Brennan et al. 2001 (Gelsomino et al. 2005).
Gram-positive irregularly (club-shaped or tapered) cells, 0.8-1.1 x 1.4-3.5 µm,  and
occur singly, in pairs with typical V forms or clumps; ovoid forms occur in older
cultures. Non-motile. Non-spore-forming. Short chain mycolic acids are present.
Tuberculostearic acid is present.
Colonies are grey-white (occasionally slight pink), circular (sometimes irregular), dry
appearance, convex and 2-4 mm in diameter . Optimum temperature: 25-30 ºC.
Grows in 7% NaCl. Strictly aerobic. CAMP test is negative.
Isolated from animal fodder.
Undetermined.
  1. Collins M.D., 1987. Transfer of Arthrobacter variabilis (Muller) to the Genus Corynebacterium, as Corynebacterium variabilis
    comb. nov. IJSB Vol. 37, No. 3, 287-288.
  2. Gelsomino R., Vancanneyt M., Snauwaert C., Vandemeulebroecke K., Hoste B., Cogan T.M. and Swings J., 2005.
    Corynebacterium mooreparkense, a later heterotypic synonym of Corynebacterium variabile. IJSEM 55, 1129-1131.
Description is based on API 50CH and API 20E results.

Positive results for catalase, esculin hydrolysis, nitrate reduction, pyrazinamidase & urease.

Negative results for alkaline phosphatase, gelatin hydrolysis, oxidase, starch hydrolysis, tyrosine hydrolysis, acid production from:
fructose, glucose, maltose, mannose & sucrose.
Corynebacterium variabile
(c) Costin Stoica
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