Optimal growth occurs at 30 ºC. Obligately microaerophilic. Cannot grow anaerobically
with nitrate. Grows in the presence of 1% glycine, but growth is inhibited by 1% bile, 1%
NaCl or KCN. No growth on EMB, MacConkey or TSI agars. No pigment is produced
from aromatic amino acids. A water-soluble fluorescent pigment is not produced.
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Chromobacteriaceae, Genus Aquaspirillum,
Aquaspirillum magnetotacticum Maratea and Blakemore 1981
Moved to genus Magnetospirillum as Magnetospirillum magnetotacticum (Maratea and Blakemore 1981) Schleifer et al. 1992.
Gram-negative, helical cells, 0.2-0.4 / 4.0-6.0 μm. Motile by a single flagellum at each
pole. Intracellular poly-beta-hydroxybutyrate is formed. Can form long chains and
coccoid bodies in older cultures. Synthesize magnetosomes, containing magnetite
(Fe3O4) particles, arranged in a chain within the cytoplasm.
Isolated from sediments collected in Cedar Swamp, Woods Hole, Massachusetts. Magnetotactic acitivity.
- Maratea (D.) and Blakemore (R.P.): Aquaspirillum magnetotacticum sp. nov., a magnetic spirillum. Int. J. Syst. Bacteriol., 1981, 31,
- 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.
- 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).
Positive results for phosphatase. Nitrate is reduced to nitrous oxide without nitrite accumulation.
Negative results for alkaline reaction in litmus milk, catalase, casein hydrolysis, esculin hydrolysis, gelatin hydrolysis, hippurate
hydrolysis, H2S production from cysteine, indole production, oxidase (weakly positive with toluene-treated cells), selenite reduction &
starch hydrolysis. No acid production from sugars. Carbohydrates are not used as sole carbon sources.
(c) Costin Stoica