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Starfishes and Horseshoe crabs
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Coelacanths, Cockroaches, Dragonflies, Lungfishes, Tuataras
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Ants, First Dinosaurs, Turtles, Crocodiles, Sharks, Skates and Rays
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Stugeons and Primitive Grebes
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Opossums and the Last Dinosaurs
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This is a modern age time where Reptiles are the dominant creatures
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Current time period where Mammals are the current most populated.