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.
- 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.
- 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.
(c) Costin Stoica