symmorid
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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
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
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
