NATS 1540 Midterm: CoursePack Notes for Exam #2
21 Nov 2017
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10ft in length with a long neck and tail, and walked on four legs similar to those seen on crocodiles today*: the teleocrater lived just after a group of reptiles called the archosaurs split into two branches. One became dinosaurs and, ultimately, birds, while the other evolved today"s crocodiles and alligators: however, its place in the evolutionary tree was unclear due to a lack of key bones, such as the ankles. 237 million years ago on the ancient continent known as gondwana, that would later become the southern hemisphere, based on a host of immaculately preserved fossils from. Triceratops, traditionally portrayed as tank-like armored beasts, may have been feathered: the system places dinosaur species into two distinct categories, ornithischia and. The group is defined as all the descendents of the last common ancestor of birds (saurischia) and triceratops (ornithischia), which have been historically on far flung branches of the family tree.
