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
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
Isolated from raw milk, partially decomposed wheat grain and infant bile.
- 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.
- 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, H2S
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 &
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