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Exam II Geology

Exam II Geology - Know the features that characterize the...

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Know the features that characterize the subdivisions on the Dinosaur classification sheet. The genera mentioned on the classification sheet are either well known or have some interesting special features. Know what is important about each. Consider the actually-known paleoecology compared to the animal descriptions in Raptor Red that you read. What seems reasonable to you and what seems speculative, given the evidence? Details from reading that are not touched upon in lecture or class discussion are unlikely to be selected for exams. Be able to sketch the two pelvis types that distinguish the two main clades of dinosaurs. Label the sketches as ornithischian or saurischian, then label the three bones in each pelvis. Try it without looking at your book. Note that the bone names are the same as the bones in your own pelvis. Label the direction of anterior. Remember the cladogram in your quiz. Some aspect of it is sure to be seen on Exam II. What are the three elements of Triassic land life? 1. flat headed large amphibians and therapsids 2. some Triassic-only animals--phytosaurs, rhynchosaurs 3. end of Triassic-- new groups which will reach main diversity later The earliest dinosaurs were Triassic. List the features that describe them. Explain how predator /prey ratios bear on the question of dinosaur endothermy. What kind of ratios might you expect in endothermic creatures? 50-50. Actually is 90-10. How does the evidence of the following relate to the question of dinosaur endothermy? Posture-- modern endotherms have fully erect posture as do dinosaurs, modern bipeds are endotherms. Trackways-- some workers estimate impressive speeds, others are doubtful. food processing in the mouth-- hadrosaurs and ceratopsians had effective chewing, the biggest types, the sauropods did not- in fact,
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with small heads and simple teeth, they had very had poor food processing in the mouth ankylosaurs and hadrosaurs had secondary palates brains-- dinosaur brains do not fit the skulls as closely as those of mammals, but some estimates can be made, re level of activity. Some are equivalent to modern birds and mammals (small active bipeds), some fall about at modern exothermic reptiles and some in between. bone morphology-- haversian canals--osteoclasts dissolve and osteoblasts follow. Dense Haversian bone is seen in dinosaurs, pterosaurs, and advanced synapsids including mammals. Lines of arrested growth--growth banding-- seasonal, seen in a variety of dinosaurs and even a K bird Zoogeography-- found in northern Alaska, southern Australia, and Antarctica Do ectothermic animals always have lower body temperature than endothermic animals? No. Give an advantage of ectothermy. Use less levels of energy in general living. Why are many large modern ectotherms water dwellers? Keeps them cool.
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Exam II Geology - Know the features that characterize the...

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