Dictionary of Human Evolution and Biology

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Second Premolar

Premolar that is posterior to the most anterior premolar of the four premolars in the primitive mammalian dentition. During the course of evolution primates have lost anterior premolars; thus, the second premolar may actually be the most anterior premolar in a species, such as in most lemurs. However, some workers number teeth by those actually present in a species; in such a case the second premolar is either the third or fourth premolar of the primitive condition.

See P1, P2, P3, etc.

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