Holotype: A specimen that forever defines a species, usually the first or the most complete specimen discovered. Dinosaurs were the only archosaurs that stood upright.Įcosystem: The complex of a community of organisms and its environment functioning as an ecological unit.įauna: Animals characteristic of a region, period, or special environment.įlora: Plants, fungi, or bacteria characteristic of a region, period, or special environment. Along with crocodiles and flying reptiles, dinosaurs are members of a reptilian sub-group called archosaurs, or ruling reptiles. Cretaceous: The final period of the Age of Dinosaurs, 66-146 million years ago.ĭinosaur: Like today’s turtles, lizards, snakes, and crocodiles, dinosaurs were reptiles.
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