C. testagleba is a huge, almost immobile single-celled creature. It is covered with hard shells, which make it practically invulnerable to the smaller predators. It basically has to be swallowed whole to be eaten. It uses photosynthesis like all of its ancestors.
Living Relatives (click to show/hide)
None found. Note that this does not necessarily mean it has no living relatives at all, but that, assuming all taxonomy is filled in, its entire phylum is extinct; any relatives it does have likely do not resemble it.