Taxonomy
Morphology
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Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Bacillaceae, Genus Bacillus, Bacillus galactosidilyticus  Heyndrickx, Logan,
Lebbe, Rodriguez-Diaz, Forsyth, Goris, Scheldeman and De Vos  2004.
Species also includes strains from
Bacillus lentus, Bacillus firmus & Bacillus circulans.
Gram-positive or Gram-variable, small, plump rods, 0.7-0.9 x 2.0-2.5 µm, motile,
central / paracentral or subterminal,  ellipsoidal endospores  in slightly swollen
sporangia.
Colonies are creamy/off-white with opaque center, smooth, flat, 1 mm in diameter
after 2 days on TSA; the margins are usually irregular with pointed projections that
may spread and become rhizoid in older cultures. Facultatively anaerobic.
Growth at pH 6 - 10.5, and at 30 - 40 ºC. Allantoin, urate or NaCl are not required for
growth.
Isolated from raw milk, partially decomposed wheat grain and infant bile.
Unknown.
  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. Heyndrickx M., Logan N.A., Lebbe L., Rodriguez-Diaz M., Forsyth G., Goris J., Scheldeman P. and De Vos P. 2004. Bacillus
    galactosidilyticus sp. nov., an alkali-tolerant beta-galactosidase producer. IJSEM 54, 617-621.
Positive results for catalase, beta-galactosidase, hydrolysis of esculin, nitrate reduction, hydrolysis of casein (weak), acid production
from: D-glucose, N-acetyl-D-glucosamine (weak) & fructose (weak).

Negative results for arginine dihydrolase, lysine decarboxylase, ornithine decarboxylase, hydrolysis of gelatin, indole production, H
2S
production, Voges-Proskauer reaction, citrate utilization, acid production from: adonitol, D-arabinose, D- or L-arabitol, dulcitol,
erythritol, D- or L-fucose, lyxose, methyl β-xyloside, glycerol, glycogen, gluconate, meso-inositol, 2- or 5-ketogluconate, sorbitol,
sorbose, xylitol & L-xylose.

Variable results for hydrolysis of urea. Weak and variable results for acid production from: L-arabinose, amygdalin, arbutin,
cellobiose, galactose, beta-gentibiose, inulin, lactose, D-mannitol, D-mannose, maltose, melezitose, melibiose, raffinose,
rhamnose, ribose, salicin, starch, sucrose, trehalose & D-xylose,   
(c) Costin Stoica
Bacillus galactosidilyticus
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