Caldicellulosiruptor acetigenus
Caldicellulosiruptor lactoaceticus
Caldicellulosiruptor kristjanssonii
Caldicellulosiruptor owensensis
Caldicellulosiruptor saccharolyticus
(tree size 1)
Caldicellulosiruptor bescii
Caldicellulosiruptor changbaiensis
Caldicellulosiruptor hydrothermalis
Caldicellulosiruptor kronotskyensis
Caldicellulosiruptor obsidiansis