Colonies on Oxoid nutrient agar containing10% horse or ox serum are nonpigmented
and about 1.0–1.5 mm in diameter. On BSTSY agar, the colonies are about 1.0–2.0
mm in diameter and exhibit a pale yellow pigmentation. Nonhemolytic. Aerobic.
Optimal temperature 37 ºC. Noncorroding colonies.
Taxonomy
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References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Neisseriaceae, Genus Alysiella, Alysiella filiformis
(Schmid 1922) Langeron 1923, species. Type species of the genus.

Old synonyms:
Simonsiella filiformis Schmid 1922, Caryophanon filiformis (Schmid 1922) Peshkoff 1948.
Gram-negative cells, grouped in multicellular filaments that are flat rather than
cylindrical and often segmented into groups of two or four cells. Cell dimensions
varies from 2.0 to 3.0 μm in diameter, and 0.6 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 guinea pigs, sheep, and cows.
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.
Positive results for catalase, glutamic acid decarboxylase, glutamylglutamate arylamidase, oxidase, acid production from: glucose,
malonate & sucrose.

Negative results for alkaline phosphatase, arginine dihydrolase, citrate utilization, esculin hydrolysis,  glutamyltransferase, gelatin
liquefaction, H
2S production, indole production, lysine decarboxylase, nitrite reduction, ONPG, omithine decarboxylase, phenylglycine
arylamidase, proline arylamidase, starch hydrolysis, urease, acid production from: adonitol, arabinose, dulcitol, dextrose, esculin,
fructose, galactose, inositol, lactose, maltose, mannitol, mannose,  raffinose, rhamnose, salicin, sorbose, trehalose & xylose.

Variable results for nitrate reduction.
Alysiella filiformis
(c) Costin Stoica
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