|-Microscopic, 0.05-2mm phophatic structures.
-Specific mode of life not fully understood.
-Some believe could be vertabrates due to phosphatic nature, but opinion is divided.
-Not known to which group of animals they belong.
|-Had suffered a near extinction in the Early Permian, but had managed to survive and modestly diversify during Permian.
-Didn't ever become major order, becoming fully extinct in Late Triassic/Early Jurassic.
-"Most Late Permian [Conodont] species passed the notorious Permian-Triassic filter with seeming indifference" (Sweet,1973).
-Seemingly only ?invertabrate? (Clark, 1986) to cross boundary with no noticeable negative effect.