No growth in the presence of 3% NaCl, 1% bile or 1% glycine. Grows on TSI agar and
in MRVP broth, but not on EMB, MacConkey or Seller agars. Aerobic. Growth
temperature range 9-40 ºC, 30-32 ºC optimum. No production of water-soluble
yellow-green fluorescent pigment. Water-soluble brown pigment is not produced in
the presence of tyrosine or tryptophan. Range of pH for growth is 5.5-8.5.
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
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References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Chromobacteriaceae, Genus Aquaspirillum,
Aquaspirillum delicatum (Leifson 1962) Hylemon et al. 1973.
Moved to genus Curvibacter as
Curvibacter delicatus (Leifson 1962) Ding and Yokota 2004.
Old synonym:
Spirillum delicatum Leifson 1962.
Description is based on a single isolated strain.
Gram-negative, vibrioid cells, 0.3-0.5 / 3.0-5.0 μm. Motile by usually 1-2 flagella at only
one pole. Intracellular poly-beta-hydroxybutyrate is formed but not evident.
Isolated from distilled water, in California.
Undetermined.
  1. 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.
  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. Hylemon (P.B.), Wells Jr. (J.S.), Krieg (N.R.) and Jannasch (H.W.): The genus Spirillum: A taxonomic study. International Journal of
    Systematic Bacteriology, 1973, 23, 340-380.
Positive results for catalase, ribonuclease, nitrate reduction only to nitrite, oxidase &
phosphatase.
Ammonium salts can be used as sole nitrogen sources (poorly).
Can utilize as sole carbon source: acetate, aconitate, isocitrate, alpha-ketoglutarate, succinate, fumarate, malate, oxaloacetate,
pyruvate, lactate, malonate & putrescine.

Negative results for alkaline reaction in litmus milk, casein hydrolysis, deoxiribonuclease, esculin hydrolysis, gelatin hydrolysis (4 days
incubation at 30 ºC), hippurate hydrolysis, H
2S production from 0.2% cysteine, indole production, selenite reduction, starch hydrolysis,
urease, acid production from sugars. Cannot utilize as sole carbon source: citrate, propionate, caproate, beta-hydroxybutyrate,
p-hydroxybenzoate, ethanol, n-propanol, n-butanol, glycerol, D-fructose, D-glucose, D-xylose, L-arabinose, L-histidine, L-tyrosine,
L-phenylalanine, L-alanine, L-glutamate, L-aspartate, L-glutamine, asparagine, L-proline, L-hydroxyproline, L-ornithine, L-citrulline,
L-arginine, L-Lysine, L-methionine, L-serine,L-cysteine, glycine, L-leucine, L-isoleucine, L-valine & L-tryptophan.
Aquaspirillum delicatum
(c) Costin Stoica
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