What are the evolutionary novelties of stegosaurs, and how does Huayangosaurus exemplify them?

What features identify a dinosaur as a thyreophoran?

Why is Scutellosaurus identified as a thyreophoran, and why is it easier to assign Scelidosaurus to the thyreophorans?

What are the evolutionary novelties of stegosaurs, and how does Huayangosaurus exemplify them?

What do paleontologists believe were the arrangement and function of the plates of Stegosaurus? Why?

How does the evolution of stegosaurs differ from that of ankylosaurs in terms of timing, distribution, and amount of morphological change?

How are ankylosaurs distinguished from other dinosaurs?

What defensive strategy did ankylosaurs employ?