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neoprioniodiform
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conodont
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neoprioniodiform

paleontology
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History

neoprioniodiform, conodont, or small toothlike phosphatic fossil of uncertain affinity, that is characterized by a main terminal cusp, varying numbers of subsidiary cusps or denticles that may be completely fused, and an underside region that is deeply grooved. Several genera are included in the neoprioniodiforms, including excellent guide fossils for the Ordovician Period.