Table 1.

Characteristics of Chloroflexi classes.

	Chloroflexiaa	Thermomicrobiab	Anaerolineaec	Caldilineaed	Ardenticateniae	Ktedenobacteriaf	Thermoflexiag	Dehalococcoidetesh	Ca. Thermofonsiai
Phototrophy	+ (reaction center-based)	–	–	–	–	–	–	–	Some (reaction center- or rhodopsin-based)
Aerobic respiration	+	+	Genes present	Genes present	+	+	Microaerophilic	Genes rarely present	Genes present
Complex III	bc, ACIII, or both	ACIII or both	ACIII, bc, or neither	bc	bc	bc	bc	Neither	bc, also ACIII with RCII
Morphology	Filamentous	Rod	Filamentous or rods	Filamentous	Filamentous	Filamentous (branched)	Filamentous	Coccoidal, discs	Unknown
Motility	Gliding	Flagellar	Flagellar or none	–	–	–	–	–	Unknown—no flagellar genes
Other metabolic traits		Nitrite oxidation			Iron and nitrogen respiration			Dehalogenation	Nitrogen respiration
Temperature range	10–67	43–80	20–73	37–65	30–75	17–74	67.5–75	15–35	32–59
% GC	48–62	56–63	48–58	59–65	51.5	54–60	69	49–54	46–63

^a(Garrity and Holt, 2001; Gupta et al., 2013).

^b(Hugenholtz and Stackebrandt, 2004; Sorokin et al., 2012).

^c(Yamada et al., 2006; Hemp et al., 2015a,b,c; Pace et al., 2015; Ward et al., 2015a,b).

^d(Yamada et al., 2006).

^e(Kawaichi et al., 2013).

^f(Cavaletti et al., 2006; Yabe et al., 2010; Chang et al., 2011).

^g(Dodsworth et al., 2014).

^h(Moe et al., 2009; Löffler et al., 2013).

ⁱThis study.