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tritubercular theory


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A theory which described the evolution of heterodont mammalian teeth from simple peg-like (haplodont) teeth with the development of two smaller cones, one in front (paracone) and one behind (metacone) the main one. This triconodont stage underwent further adaptation with the paracone and the metacone becoming external to the original cone (protocone) in the upper jaw and internal in the lower jaw to create a triangular-shaped tooth with a cone at each angle (tritubercular tooth). These tritubercular teeth are a very common occurrence in ancestral mammals.

Subjects: Dentistry.


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