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Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Alicyclobacillaceae, Genus Kyrpidia, Kyrpidia tusciae (Bonjour and Aragno
1985) Klenk et al. 2011. Basonym:
Bacillus tusciae Bonjour and Aragno 1985.
Gram-positive, motile by one lateral flagellum, straight rods, 0.8 x 4-5 µm. Produce
subterminal, ellipsoidal spores, which swell the sporangia.
The spreading colonies are creamy-white and chalky; heavy autotrophic cultures form
a yellow, water-soluble pigment. Aerobic. Facultatively chemolithoautotrophic.
Autotrophic with H
2 + CO2 or CO.
Moderately thermophilic; growth temperature 50-55 ºC (optimum 55 ºC), pH 3.5-6. No
growth in 1-10% NaCl media. NaCl, alantoin or urate are not required for growth.
Isolated from an acidic pond in a solfatara in Italy.
Undetermined.
  1. N.A. Logan and P. De Vos, 2009. Genus I. Bacillus Cohn 1872. In: (Eds.) P.D. Vos, G. Garrity, D. Jones, N.R. Krieg, W. Ludwig, F.A.
    Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3: The Firmicutes, Springer, 21-127.
  2. H.-P. Klenk et al., 2011. Complete genome sequence of the thermophilic, hydrogen-oxidizing Bacillus tusciae type strain (T2T) and
    reclassification in the new genus, Kyrpidia gen. nov. as Kyrpidia tusciae comb. nov. and emendation of the family
    Alicyclobacillaceae da Costa and Rainey, 2010. Standards in Genomic Sciences 5: 121-134.
Carbohydrates are not metabolized.
Can utilize ammonium ions, asparagine and urea as sole nitrogen sources.

Positive results for hydrolysis of urea, nitrate reduction, catalase (weak) & oxidase (weak).

Negative results for hydrolysis of starch, citrate utilization, acid production from: L-arabinose, D-glucose, D-mannitol, D-mannose,
methyl beta-xyloside, glycogen, salicin, starch & D-xylose.
Kyrpidia tusciae
(c) Costin Stoica
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