Explain the term thecodont and diphyodont.


Humans and other mammals, including geckos, vertebrates, and reptiles are all classified as thecodonts and diphyodonts.

  • Thecodont dentition is a dentition in which the base of the tooth is enclosed in jaw sockets. The tooth is embedded in a socket of jawbone. Ankylosis is absent and the roots are cylindrical. Examples include living crocodilians and mammals.
  • Diphyodont is a type of dentition in which two successive sets of teeth are developed during the lifetime of the organism. The first set of teeth is deciduous and the other set is permanent. The deciduous set of teeth is replaced by the permanent adult teeth.

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