Final answer:
The key character that gives the genasaurian dinosaurs their name is their unique hip structure.
Step-by-step explanation:
The key character that gives the genasaurian dinosaurs their name is their unique hip structure. Genasaurians are a group of herbivorous dinosaurs that belong to the suborder of ornithischians. Their hips have a distinctive fused pelvis structure called a synsacrum, which sets them apart from other types of dinosaurs.
For example, the well-known Triceratops is a genasaurian dinosaur. By examining its hip structure, paleontologists can determine that it is part of the genasaurian group.
Understanding the unique hip structure of genasaurian dinosaurs helps scientists classify and identify different types of dinosaurs based on their skeletal features.