Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Eucynodontia ("true dog teeth") is a grouping of animals that includes both mammals, such as dogs, and mammal-like non-mammalian Therapsids ("mammal- like reptiles") such as Cynodonts ("dog teeth"). Its membership was and is made up of both carnivores and herbivores. The chronological range extends from at least the Lower Triassic, possibly the Upper Permian, until the present day. This overview is concentrated on the proto-mammals, which are known from the Lower Triassic until the Lower Cretaceous, both divisions of the Mesozoic era ("the age of the Dinosaurs").

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