A peculiar toothlike fossil of many forms, found especially in carboniferous rocks. Such fossils are supposed by some to be the teeth of marsipobranch fishes, but they are probably the jaws of annelids.

tiny fossil cone-shaped tooth of the most primitive vertebrate: the conodont

small (2 in) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes

Conodont - A small, tooth-shaped fossil of uncertain origin, relatively common in the Pennsylvanian and Permian rocks of Nebraska.