text: Based on this animal's very small brain, Othniel Marsh incorrectly concluded that the species had a second brain located in their hips.
full_question: Based on this animal's very small brain, Othniel Marsh incorrectly concluded that the species had a second brain located in their hips. Armatus, stenops, and longispinus are the three known species of this herbivore, which existed in the Jurassic period. This dinosaur's back was covered with distinctive triangular plates, and it had a spiked tail. This is for ten points what dinosaur whose name means roof lizard?
first_sentence: Based on this animal's very small brain, Othniel Marsh incorrectly concluded that the species had a second brain located in their hips.