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18 Cards in this Set
- Front
- Back
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What does the name Ornithischia mean? Why is this ironic?
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bird hipped, but birds were not members of this family.
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What was the feeding mode of Ornithischia?
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herbivores
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What is the pelvic structure of Ornithischia?
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pointed backward, parallel to ischium
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What do Ornithischia have that sets them apart from other dinos?
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Predentary bone, in lower jaw.
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What types of dinos are Ornithischia?
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armored, horned, duckbilled
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When did Ornithischia die out?
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End of the Cretaceous
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What are the three group of Ornithischia?
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Thyreo, Margin, Ornithopoda
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What are characteristics of Thyreo... dinos?
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shield bearers with dorsal armor.
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Ornithiopoda split into three groups. What are they?
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Heterodonts, Hypsilo.., Igunadons.
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What did Ornithischa evolve?
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body armor and beaked heads.
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What is the most likely cause of the K-T extinction? and why?
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an asteroid, the chickx... crater, shocked quartz, and high levels of iridium.
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How many species died in the extinction?
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64-70% off all, and all animals over 55 lbs died.
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Some organisms survived K-T, why?
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they could live with low oxygen levels, didnt need photosynthesis, could live off dirt or decomposed matter
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Because of the survival of many terrestrial species what happend to some stupid theory? What theory?
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its was wrong, there, and it is the BI theory, Biogeographic Interchange. by Robert Bukker
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What is the chain reaction that the asteroid caused?
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killed off plants, which killed of herbivores, which killed off carnivores.
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What was the weather pattern like after the asteroid?
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extreme heat, followed by cold and darkness, then greenhouse warming.
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what is another possible factor for the extinction?
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climate change
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How long did the K-T extinction take?
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still disputed.
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