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the posterior process (extension/growth) of the jugal bone being short, reduced or absent interdental (between teeth) plates/laminae, and the wall of bone enclosing the teeth from the mouth on the inner surface of the upper and lower jaws being reduced or absent, corresponding with the development of an ancestrally pleurodont dentition. Members of the group are ancestrally and are almost exclusively (with the exception of mosasaurs)

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