diplodont
an early form of shark tooth, found in xenacanths for example, characteristically having two prongs or cusps. See also cladodont, hybodont and symmorid

Dictionary of ichthyology. 2009.

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  • cladodont — a form of early shark tooth, characteristically with a large central cusp, a broad base and smaller lateral cusps, found in sharks such as Cladodus from the Upper Devonian. See also diplodont, hybodont and symmorid …   Dictionary of ichthyology

  • hybodont — a form of early (Devonian to Mesozoic) shark tooth, characteristically elongate, low in profile, with sinuous ridges and pierced by numerous nutrient canals. Named for the genus, Hybodus. See also cladodont, diplodont and symmorid …   Dictionary of ichthyology

  • symmorid — a form of early shark tooth, similar to cladodont teeth with a main central cusp and smaller lateral cusps, but appearing later in the fossil record (late Devonian). See also diplodont, cladodont and hybodont …   Dictionary of ichthyology

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