Colonies on R2A agar are 1-2.5 mm in diameter, opaque with a smooth, shiny
surface and butyrous with entire margins. Colonies on Columbia agar are grey-white,
umbonate, 3.2-4 mm in diameter, on H3P are cream–white, 0.5-0.7 mm and on BTS
are cream-white, 1.0-2.2 mm. Aerobic, facultatively anaerobic. Growth occurs at 4-32
ºC (optimum 28 ºC), optimum pH 7.3-7.6. Grows in 0-2% NaCl media.
Taxonomy
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References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Chromobacteriaceae, Genus Deefgea, Deefgea rivuli
Stackebrandt et al. 2007, type species of the genus.
Gram-negative rods, with one round end and one pointed end, 0.7-0.8 x 3-4 μm, up to
7 μm in older cultures. Motile by one polar flagellum. Highly motile at temperatures
below 10 ºC. Poly-beta-hydroxybutyrate accumulation is observed.
Isolated from water of the Westerhofer Bach, near Westerhof, Lower Saxony, Germany.
Resistant to penicillin G, oxacillin, ampicillin, cephalothin, cefotaxime, pipemidic acid, erythromycin, vancomycin, lincomycin;
intermediately susceptible to norfloxacin, ofloxacin, colistin; susceptible to tetracycline, chloramphenicol, imipenem and doxycycline.
Undetermined.
  1. Erko Stackebrandt, Elke Lang, Sylvie Cousin, Orsola Pauker, Evelyne Brambilla, Reiner Kroppenstedt and Heinrich Lunsdorf: :
    Deefgea rivuli gen. nov., sp. nov., a member of the class Betaproteobacteria. Int. J. Syst. Evol. Microbiol., 2007, 57, 639-645.
  2. Chen W.M., Chung Y.N., Chiu T.F., Cheng C.Y., Arun A.B. and Sheu S.Y.: Deefgea chitinilytica sp. nov., isolated from a wetland. Int.
    J. Syst. Evol. Microbiol., 2010, 60, 1450-1453.
  3. Sato K., Kato Y., Taguchi G., Nogawa M., Yokota A. and Shimosaka M.: Chitiniphilus shinanonensis gen. nov., sp. nov., a novel
    chitin-degrading bacterium belonging to Betaproteobacteria. J. Gen. Appl. Microbiol., 2009, 55, 147-153.
  4. Yoon J.H., Choi J.H., Kang S.J., Choi N.S., Lee J.S. and Song J.J.: Jeongeupia naejangsanensis gen. nov., sp. nov., a cellulose-
    degrading bacterium isolated from forest soil from Naejang Mountain in Korea. Int. J. Syst. Evol. Microbiol., 2010, 60, 615-619.
  5. Euzeby (J.P.): List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet. Int. J. Syst. Bacteriol.,
    1997, 47, 590-592. (List of Prokaryotic names with Standing in Nomenclature. http://www.bacterio.net).
Most results are based on API Biomerieux and Biolog GN2 tests.

Positive results for catalase, nitrate reduction to nitrite, oxidase, acid production from glucose (negative in Chen's study) & sucrose.
Can utilize in API 20 NE (weakly): glucose, N-acetylglucosamine & gluconate.
Can utilize in API 50 CH + AUX medium: ribose, glucose, fructose, N-acetylglucosamine,sucrose & gluconate.
Oxidize in Biolog GN2: dextrin, N-acetylglucosamine, D-fructose, beta-D-glucose; D-mannose (weak), methylpyruvate (weak) and
beta-hydroxybutyric acid (weak).

Negative results for alkaline phosphatase, chitin hydrolysis (weak positive in Chen's study), cellulose hydrolysis, casein hydrolysis,
DNase, gelatin hydrolysis, beta-glucosidase, starch hydrolysis & xylan hydrolysis.
Deefgea rivuli
(c) Costin Stoica
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