Turtles (Testudinata sensu Joyce et al., 2004) are a diverse group of reptiles with an unusual “bauplan” fundamentally different from that of other amniotes. Unique morphological characters, including ...

Though hardly a household name like Velociraptor or Tyrannosaurus rex, Megalosaurus holds a key place in the history of paleontology. That’s not because it’s an exceptional dinosaur but as it was the ...

这对鸟类的飞行至关重要，这个我们后面再说。 始祖鸟和今天的鸟类，都属于恐龙总目（Dinosauria）-兽脚亚目（Theropoda）-虚骨龙类 （Coelurosauria）-手盗龙类（Maniraptora）-近鸟类（Paraves）。 近鸟类下面分支出鸟翼类（Avialae）和恐爪龙类（Deinonychosauria）。