Question

Explain the term thecodont and diphyodont.

Answer 1

Thecodont means fossil quadrupedal or partly bipedal reptile of the Triassic period, having teeth fixed in sockets in the jaw. Thecodonts are ancestral to the dinosaurs and other archosaurs.




Diphyodont means any animal with two successive sets of teeth, initially the "deciduous" set and consecutively the "permanent" set. Most mammals are diphyodonts—as to chew their food they need a strong, durable and complete set of teeth.

Answer 2

Thecodont and Diphyodont

Explanation:

• Based upon the mode of attachment of teeth with the jaw, teeth are classified as thecodont, Arcodont and Pleurodont.
• Based upon the succession and replacement of teeth, the teeth are classified as Monophyodont, diphyodont and polyphyodont.

Thecodont:

• The type of arrangement in which the teeth are found completely fixed in the jaw sockets, it is called Thecodont arrangement.
• Usually, mammals including humans have such type of arrangement.

Diphyodont:

• The presence of two successive sets of teeth due to replacement is called diphyodont.
• In humans, the milk teeth are replaced by permanent teeth due to which they have diphyodont teeth.

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