
1) Tooth
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https://www.crosswordclues.com/clue/conodont

Conodonts are extinct chordates resembling eels, classified in the class Conodonta. For many years, they were known only from tooth-like microfossils now called conodont elements, found in isolation. Knowledge about soft tissues remains relatively sparse. The animals are also called Conodontophora (conodont bearers) to avoid ambiguity. The conodon...
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http://en.wikipedia.org/wiki/Conodont

• (n.) 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.
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http://thinkexist.com/dictionary/meaning/conodont/

minute toothlike fossil composed of the mineral apatite (calcium phosphate); conodonts are among the most frequently occurring fossils in marine ... [8 related articles]
Found on
http://www.britannica.com/eb/a-z/c/129
Co'no·dont (kō'no*dŏnt)
noun [ Greek
kw^nos cone +
'odoy`s ,
'odo`ntos , tooth.]
(Zoology) 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,...
Found on
http://www.encyclo.co.uk/webster/C/139

Microscopic tooth-shaped parts of an eel-like swimming vertebrate distantly related to modern chordates. (Cambrian to Triassic)
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http://www.fossilmall.com/Science/Glossary.htm

[
n] - tiny fossil cone-shaped tooth of the most primitive vertebrate: the conodont 2. [n] - small (2 in) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone
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http://www.webdictionary.co.uk/definition.php?query=conodont

a Paleozoic microfossil occurring in various jagged or toothlike shapes and constituting the hard remains of an extinct marine animal of the order Conodonta (or Conodontophorida), found abundantly worldwide in sedimentary rock.
Found on
https://www.infoplease.com/dictionary/conodont
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