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Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Bacillaceae, Genus Bacillus, Bacillus selenitireducens Switzer Blum,
Burns Bindi, Buzzelli, Stolz and Oremland 2001.
Description is based on a single isolate.
Gram-positive, nonmotile, 0.5 x 2-6 µm, nonspore-forming rods.
Produce red colonies on lactate/selenite/yeast extract-supplemented lake water
medium incubated anaerobically at 20 ºC. Shows weak microaerobic growth and
anaerobic respiratory growth with Se(IV) (selenite), As(V) (arsenate), nitrate, nitrite,
trimethylamine oxide and fumarate as electron acceptors; quantitatively reduces Se
(IV) to Se (0) (elemental selenium) during growth.
Moderately halophilic, with salinity optimum of 24–60 g/l NaCl; moderately alkaliphilic.
NaCl is required for growth. Grow in 2 -10% NaCl broth. Optimum pH: 9-10.
Allantoin or urate are not required for growth.
Isolated from arsenic-rich sediment of Mono Lake, California
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.
Positive results for catalase & nitrate reduction. Negative results for oxidase & citrate utilization.
Bacillus selenitireducens
(c) Costin Stoica
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