Lecture 18 - Lecture 18 Dinos Birds the K-T and early...

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Lecture 18 Dinos, Birds, the K-T, and early Cenozoic Life A. Beelzebufo ampinga- The 16 in, 10 pounds ancient frog lived 65-70 million years ago o The largest living frog today is the goliath frog of West Africa, which attain lengths of 12.5 inches, 7.2 pounds Beelzebufo was capable of killing lizards and other small vertebrates, perhaps even hatchling dinosaurs B. Dinosaur factoid- Oldest dinosaur: later in the Triassic Period (~230 Ma) Dominant land animal for ~170 m.y., quite diverse: ~360 genera described (compare with (~175 genera of large mammals today) Cladistically speaking modern birds and dinosaurs o So the group they call dinosaurs, never really went extinct Dinos defined by a bipedal stance and have diapsid skull o Big herbivores quadrupeds revert secondarily C. Ornithischains- Late Triassic to end-Cretaceous, entirely herbivorous A diverse range of forms, most successful herbivores in the Mesozoic Cretaceous form include the armored dinos, the duckbill dinos, and very
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