Question

dentition in reptiles ???​

Answer 1

The skulls of the several subclasses and orders vary in the ways mentioned below. In addition to differences in openings on the side of the skull and in general shape and size, the most significant variations in reptilian skulls are those affecting movements within the skull.

As a group, reptilian skulls differ from those of early amphibians. Reptiles lack an otic notch (an indentation at the rear of the skull) and several small bones at the rear of the skull roof. The skulls of modern reptiles are also sharply set off from those of mammals in many ways, but the clearest differences occur in the lower jaw and adjacent regions. Reptiles have a number of bones in the lower jaw, only one of which, the dentary, bears teeth. Behind the dentary a small bone, the articular, forms a joint with the quadrate bone near the rear of the skull. In contrast, the lower jaw of a mammal is made up of a single bone, the dentary; the articular and quadrate have become part of the chain of little bones in the middle ear. An almost complete transition between these two very different arrangements is known from fossils of early synapsids (order Therapsida).

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Answer 2

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The dentition of most reptiles shows little specialization in a given row of teeth. A dentition that divides groups of teeth into distinctive bladelike incisors, tusklike canines, and flat-crowned molars occurs in mammals but does not occur in reptiles.