Aerobe. Can grow at 27 and 37 ºC, but not at 43 ºC. Grows at pH 6.0, but not at pH
8.0. Grows in 1% NaCl, but not in 2% NaCl. Weak beta-hemolysis.
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Neisseriaceae, Genus Simonsiella, Simonsiella
muelleri Schmid 1922 - type species of the genus.
Old synonym: Caryophanon muelleri (Schmid 1922) Peshkoff 1948, Scheibenbakterien Müller 1911.
Gram-negative cell wall. Grouped in multicellular ﬁlaments. The long axis of the cells
(width of ﬁlament) varies from 2.5 to 3.5 μm, with an average of about 2.5-3.2 μm; the
short axis (length of individual cell) varies from 0.7 to 0.9 μm, with an average of about
0.8 μm. Gliding motility.
Isolated from the oral cavity of humans.
- Tone Tonjum, 2005. Order IV. Neisseriales ord. nov. In: Bergey’s Manual of Systematic Bacteriology, Second edition, Vol two, part C
The Alpha-, Beta-, Delta-, and Epsilonproteobacteria, George M. Garrity (Editor-in-Chief), pp 774-863.
Some results are based on API ZYM test.
Positive results for catalase, oxidase, acid production from: fructose, glucose, malonate & maltose.
Negative results for alkaline phosphatase, arginine dihydrolase, casein hydrolysis, esculin hydrolysis, hippurate hydrolysis, gelatin
hydrolysis, glutamyltransferase, indole production, lysine decarboxylase, omithine decarboxylase, ONPG, starch hydrolysis, urease,
alpha-fucosidase, lipase (C14), alpha-chymotrypsin, alpha- and beta-galactosidase, beta-glucuronidase, N-acetyl-beta-
glucosaminidase, alpha-mannosidase, trypsin, acid production from: arabinose, adonitol, dulcitol, dextrose, esculin, galactose,
lactose, mannitol, mannose, rafﬁnose, rhamnose, ribose, salicin, sorbose, sucrose, trehalose & xylose.
Variable results for H2S production, nitrate reduction & nitrite reduction.
(c) Costin Stoica