There are two clades within the group ankylosauria: Ankylosa…

There are two clades within the group ankylosauria: Ankylosauridae and Nodosauridae. Nodosaurs can be diagnosed by the distinctive acromial process (large knob of bone on the shoulder blade) and parascapular spines (shoulder spines). Below, label the nodosaurid and the ankylosaurid:

Tyrannosauroidae include basal members (e.g. Eotyrannus, Dil…

Tyrannosauroidae include basal members (e.g. Eotyrannus, Dilong, and Aviatyrannis) and more advanced clade Tyrannosauridae (which includes Tyrannosaurus rex).  Discuss the key differences between the basal members and Tyrannosauridae, and talk about their evolutionary trend.