Beta-hemolysis. Aerobic. Optimal temperature 37 ºC. Noncorroding colonies.
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
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Pathogenicity
References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Neisseriaceae, Genus Alysiella, Alysiella crassa
(Schmid 1922) Xie and Yokota 2005.

Old synonyms:
Simonsiella crassa Schmid 1922 (Approved Lists 1980),
Caryophanon crassa (Schmid 1922) Peshkoff 1948.
Gram-negative cells, grouped in multicellular filaments that are flat rather than
cylindrical and often segmented into groups of eight cells. Cell dimensions varies
from 2.0 to 8.0 μm in diameter, and 0.5 to 1.3 μm in length. The long axis of the
individual cells is perpendicular to the long axis of the filament.Gliding motility of the
entire filament in the direction of the long axis when the flat side of the filament is in
contact with a surface. Endospores are not formed.
Isolated from the oral cavity of sheep.
Inhabitant of the oral cavity of warm-blooded vertebrates, where it apparently is nonpathogenic.
  1. 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.
  2. Xie (C.H.) and Yokota (A.): Phylogenetic analysis of Alysiella and related genera of Neisseriaceae: proposal of Alysiella crassa
    comb. nov., Conchiformibium steedae gen. nov., comb. nov., Conchiformibium kuhniae sp. nov. and Bergeriella denitrificans gen.
    nov., comb. nov. J. Gen. Appl. Microbiol., 2005, 51, 1-10.
Positive results for catalase, gelatin liquefaction, nitrate reduction, nitrite reduction, phenylglycine arylamidase, acid production from:
fructose, glucose, malonate, sucrose & trehalose.

Negative results for alkaline phosphatase, arginine dihydrolase, citrate utilization, esculin hydrolysis, glutamyltransferase, indole
production, lysine decarboxylase, ONPG, omithine decarboxylase, proline arylamidase, starch hydrolysis, urease, acid production
from: adonitol, dulcitol, dextrose, esculin, galactose, inositol, lactose, maltose, mannitol, mannose,  raffinose, rhamnose, salicin,
sorbose & xylose.

Variable results for H
2S production, acid production from: arabinose & inulin (different results due to different testing methods).
Alysiella crassa
(c) Costin Stoica
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