Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Lactobacillaceae, Genus Lactobacillus, Lactobacillus senioris Oki,
Kudo and Watanabe 2012.
Description is based on a single isolate.
Gram-positive rods, 0.7 x 1.0-10.0 µm, occurring singly, in pairs or in short chains.
After anaerobic growth at 37 ºC for 72 h, colonies on MRS agar are circular, 1.0-2.0
mm in diameter and beige with a smooth or rough surface. Facultatively anaerobic.
Can grow at 10 ºC, but not at 45 ºC. Range of pH 4.0-8.5. Weak growth in 5% NaCl; no
growth in 8% NaCl.
Isolated from faeces of a 100-year-old elderly female person in Okinawa Japan.
- Oki K., Kudo Y. and Watanabe K., 2012. Lactobacillus saniviri sp. nov. and Lactobacillus senioris sp. nov., isolated from human
faeces. IJSEM 62, 601-607.
Positive results for arginine hydrolysis (NH3), fermentation of: L-arabinose, fructose, glucose (acid and gas production), gluconate,
N-acetylglucosamine (weak reaction), ribose, trehalose, and D-xylose.
Negative results for aesculin hydrolysis, catalase, nitrate reduction, fermentation of: adonitol, amygdalin, D-arabinose, D- or
L-arabitol, arbutin, cellobiose, dulcitol, erythritol, fucose, galactose, glycerol, glycogen, beta-gentiobiose, 2- or 5-ketogluconate,
inositol, inulin, lactose, D-lyxose, maltose, mannitol, mannose, melezitose, melibiose, raffinose, rhamnose, salicin, sorbitol, sorbose,
starch, sucrose, tagatose, turanose, xylitol, and L-xylose.
(c) Costin Stoica