Evolution What the Fossils Say and Why it Matters

Onto the Land and Back to the Sea: The Amniotes 255 further reduced a lot of the bone to cartilage, another sign of a largely aq ...

256 Evolution? The Fossils Say YES! snout than nothosaurs (but still retaining the nasal bones, which are lost in plesiosaurs), ...

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258 Evolution? The Fossils Say YES! crawl on its belly. Most people have bad feelings about snakes for a variety of reasons on w ...

Onto the Land and Back to the Sea: The Amniotes 259 (A) (B) FIGURE 11.10. The evolutionary transition from small bipedal archosa ...

260 Evolution? The Fossils Say YES! suddenly they lunge at their prey and grab it and drag it underwater in their “death roll.” ...

Onto the Land and Back to the Sea: The Amniotes 261 because it was one of the first early crocodilians to be described. This cre ...

262 Evolution? The Fossils Say YES! Li, Chun, Xiao-Chun Wu, Olivier Rieppel, Li-Ting Wang, and Li-Jun Zhao. 2008. An ancestral t ...

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FIGURE 12.1. (A) The famous specimen known as “Dave” or more formally, Sinornithosaurus, a feathered nonflying dinosaur from the ...

12 Dinosaurs Evolve—and Fly Dinosaur Transitions Long, long before you and I were born, there were dinosaurs all over the earth, ...

266 Evolution? The Fossils Say YES! Lifestyles of the Huge and Ancient Of all creatures that have ever lived, the dinosaurs are ...

Dinosaurs Evolve—and Fly 267 were no transitional forms between them and other dinosaurs. He even made the same claim in his 199 ...

FIGURE 12.2. The prosauropods were transitional forms between smaller primitive bipedal dinosaurs like Eoraptor and the sauropod ...

FIGURE 12.3. (A) Partial skeleton of a primitive archosaurian relative of dinosaurs known as Euparkeria from the Early Triassic ...

270 Evolution? The Fossils Say YES! To a casual observer, they look very similar, but to a paleontologist with anatomical traini ...

Dinosaurs Evolve—and Fly 271 the consensus was that therizinosaurs were indeed theropods that had somehow returned to plant eati ...

272 Evolution? The Fossils Say YES! In the case of the Ceratopsia, the transition is clear. All of the creatures with horns can ...

FIGURE 12.7. The evolutionary tree of the horned dinosaurs from Yinlong and other primitive marginocephalans. (Drawing by Carl B ...

FIGURE 12.8. (A) The primitive marginocephalan Yinlong, which shows skull features linking both horned dinosaurs (ceratopsians) ...