Table 3.

Features differentiating the genus Fluviispira from the genus Silvanigrella

w, Weak; +, positive; −, negative.

Characteristic	Fluviispira	Silvanigrella
Pigmentation, liquid media	Purple, grey, bright orange	Grey-red
Pigmentation, agar plates	Purple	Red
Assimilation of:
Glucuronamide	−	+
α-d-Glucose	−	+
α-Keto-glutaric acid	−	+
Acetoacetic acid	−	w
d-Galactose	−	w
l-Glutamic acid	−	+
d-Gluconic acid	w	−
ß-Hydroxy-d,l-butyric acid	w	−
l-Malic acid	+	−
l-Arginine	w	−
Glycerol	w	−
Melibiose	w	−