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Skin reinforced except on underside by dermal bones (bony plates) (Fig. 4); virtually hairless except on belly; limbs strong and feet heavily clawed; mouth opening very restricted; tongue long and protrusible; teeth consisting of eight simple teeth in the side of each jaw
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Skin not armored with bone; body covered with hair; limbs various; mouth normally gaping; tongue not exceptionally long and protrusible; teeth differentiated, some occupying front of jaws
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