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20 Cards in this Set
- Front
- Back
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When was the Cretaceous period?
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144-65 MA
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When did Ornithischinas grow abundantly?
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the Triassic
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What distinction did Ornithischians hold during the Cretaceous?
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they were the main terrestrial vertebrate
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Where and when did the first fossilized ornithischian found live?
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late Jurassic in Argentina.
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What type of hip structure do Ornithschians have?
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backward, parallel to ischium
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What does the name Ornithschian mean?
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bird hipped
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What was the feeding mode, living style of ornischians?
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herbivores that lived communally
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What do ornischians have along their spines?
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ossified tendons
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What are the three major groups of Ornithischia?
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Thyreophora, Marginocephalia, and Ornithopoda.
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Three examples of Ornithischia.
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Stegosaurus, Triceratops, Hadrosaurs.
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Birds are possibly related to what type of dino?
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theropods
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What is the first known bird fossil to be found and where?
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Archeaopteryx in Germany
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What are two types of Cretaceous birds?
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Enanthiornithines, and Ornithurines.
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What survived the K-T extinction.
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In my bed fish fart para cold medicine.
insects, mammals, birds,fish, flowers, plants, coral and mollusks. |
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Almost all modern birds appeared how many years after the K-T extinction?
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12 million
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Two reasons birds survived.
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very little competition for food, and birds have very adaptive traits.
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What are three similarities between dinos and birds?
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furcula (colar bone), astragalus (ankle bone) and toe structure
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Who said that birds did not come from dinos because of the furcula found in birds but not some dinos?
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Gherhand Heilmann, theropods
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What do most paleontologists use to show bird lineage from dinos?
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cladistic perspective
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What are two important non avian dinos from the Cretaceous?
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caudipteryx and sinornithosarus
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