Susceptible to
desferrioxamine
Testosterone
utilization
Growth at
44 ºC
Pyrrolidone
aminopeptidase
Tyrosine
hydrolysis
3-Hydroxybenzoate
assimilation
L-alanine
assimilation
C. testosteroni
-
+
-
+
+
+
+
C. terrigena
+
-
-
+
+
-
+
C. aquatica
+
-
-
-
-
-
-
C. kerstersii
+
-
+
-
+
-
-
Comamonas aquatica (Aquaspirillum aquaticum)
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Chromobacteriaceae, Genus Aquaspirillum,
Aquaspirillum aquaticum Hylemon et al. 1973.
Moved to Class Betaproteobacteria, Order Burkholderiales, Family Comamonadaceae, Genus Comamonas, Comamonas aquatica
(Hylemon et al. 1973) Wauters et al. 2003.

Sy
nonyms: Comamonas aquatica  was previously known as Comamonas terrigena
DNA group 2 or Comamonas terrigena biovar aquaticum.
Gram-negative rods, 0.5-0.6 μm. Motile by multitrichous polar flagella, often with
bipolar tufts. Intracellular poly-beta-hydroxybutyrate is formed.
After 24 h incubation at 30 ºC, colonies reach a diameter of 1-1.5 mm on blood agar.
Grows aerobically on Tryptic Soy agar and broth at 30 and 35 ºC. Moderate and delayed
growth in broth may be observed at 40 ºC; no growth at 42 ºC.  No growth occurs in the
presence of 3% NaCl, 1% oxgall or 1% glycine. Grows on EMB, TSI, MacConkey agar,
Seller agar and in MRVP broth. PH range for growth: 5.5-8.5. Pigments are not formed
from aromatic amino acids. No alkaline reaction in litmus milk.
Isolated from fresh water. Susceptible to desferrioxamine and colistin.
Undetermined.
  1. Wauters (G.), De Baere (T.), Willems (A.), Falsen (E.) and Vaneechoutte (M.): Description of Comamonas aquatica comb. nov. and
    Comamonas kerstersii sp. nov. for two subgroups of Comamonas terrigena and emended description of Comamonas terrigena.
    Int. J. Syst. Evol. Microbiol., 2003, 53, 859-862.
  2. 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).
  3. Tone Tonjum, 2005. Order IV. Neisseriales ord. nov. In: Bergey’s Manual of Systematic Bacteriology, Second edition, Vol two, part
    C The Alpha-, Beta-, Delta-, and Epsilonproteobacteria, George M. Garrity (Editor-in-Chief), pp 774-863.
Positive results for catalase, RNase, H2S production from cysteine, nitrates reduction (but nitrites not), oxidase & phosphatase.
Can utilize for growth: citrate (Simmons), glutamate, glycine, tryptophan, propionate, valerate, 3-hydroxybutyrate, L-proline, itaconate,
suberate, acetate & lactate.

Negative results for arginine dihydrolase, casein hydrolysis, DNase (type strain is positive), esculin hydrolysis, gelatin hydrolysis,
hippurate hydrolysis, indole production, lysine decarboxylase, ornithine decarboxylase, pyrrolidone arylamidase, starch hydrolysis,
trypsin, tyrosine hydrolysis & urease. Carbohydrates are neither acidified nor assimilated.
Cannot utilize histidine, 3-hydroxybenzoate & L-alanine.
(c) Costin Stoica
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Differential characters of C. testosteroni, C. terrigena, C. aquatica and C. kerstersii:
Legend: + positive 100%, - negative 100%