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Based on phylogenetic bracketing, knowledge that both birds and crocodiles have four-chambered hearts would lead us to conclude that ornithischian dinosaurs and saurischian dinosaurs also have four-chambered hearts.
ornithischian, a certain member of the humongous taxonomic group of herbivorous dinosaurs that includes Triceratops and all dinosaurs related to it more closely than birds. The saurischians make up one of the two primary types of dinosaurs, the other being the ornithischians. Ornithischians were so named because their hip bones were superficially similar to those of birds, with a large portion of the pubic bone pointing down and toward the tail rather than down and forward as in other reptiles. Ornithischians, despite their name, are not related to birds, which evolved from theropod saurischian dinosaurs.
Theropods and sauropodomorphs are the two major groups of saurischians. Theropods were two-legged carnivores that evolved into birds at least 144 million years ago from theropods. Like all other tetrapods, saurischian, or "lizard-hipped," dinosaurs had pelves (hips) made up of three elements: the ilium, ischium, and pubis. The saurischians are divided into two groups. Sauropoda were large herbivores that included Apatosaurus and Diplodocus.
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