Genus Arcanobacterium
Collins, Jones and Schofield, 1983
Gram-stain-positive, non-acid fast, non-motile, slender, irregular,
bacillary forms; many cells are arranged in V-formations. In prolonged
incubation become granular and segmented so that they resemble
small and irregular cocci. Endospores are not formed. Facultatively
anaerobic. Growth is enhanced by blood or serum. Some species are
recovered from human clinical material. All medical arcanobacteria
are catalase-negative. Nitrate reduction is usually negative.
(c) Costin Stoica
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PROKARYOTAE
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NOTES

Actinomyces gerencseriae Johnson et al.
1990 was previously known as
Actinomyces israelii serovar II.

All members of the Genus Falcivibrio were
moved to Genus Mobiluncus.
LEGEND
* marked species are not included
in ABIS biochemical database
Family Actinomycetaceae
Buchanan 1918
Genus Actinobaculum
Lawson et al. 1997
Genus Actinomyces
Harz 1877
Genus Actinotignum
Yassin et al. 2015
Genus Flaviflexus
Du et al. 2013
Genus Mobiluncus
Spiegel and Roberts 1984
Genus Trueperella
Yassin et al. 2011
Genus Varibaculum
Hall et al. 2003
Gram-positive / -variable, straight or slightly curved, predominantly
diphtheroidal, nonmotile rods, some of which tend to form branched
filaments of up to 1 mm in diameter. Some species are coccoid.
Endospores are not formed. Non-acid fast. Facultative anaerobes, some
are anaerobic. Catalase and nitrate reduction are variable. Indole is
not produced. Some species are greening the blood agar.