摘要
Pterosaurs are the earliest vertebrates known to be able to fly in the sky. They existed from the Late Triassic to the end of the Cretaceous (about 220 to 65 million years ago), when the land was ruled by another
Pterosaurs are the earliest vertebrates known to be able to fly in the sky. They existed from the Late Triassic to the end of the Cretaceous （about 220 to 65 million years ago）, when the land was ruled by another kind of reptile--dinosaurs. Pterosaurs consist of the long-tailed Rhamphorhynchoidea and the short-tailed Pterodactyloidea. The former is a basal group and the latter is more derived.
作者简介
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