GLY1102 Topic 23
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The Iguanodontia have closely packed batteries of teeth.
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True
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Hadrosaurus are differentiated into two subfamilies based upon their skull characteristics, the flat-roofed or solid-crested Hadrosaurinae and the hollow-crested Lambeosaurinae.
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True
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Saurolophus and Prosaurolophus are two examples of members of the Hadrosaurinae which includes those hadrosaurids with a fairly flat skull roof or head crest of solid bone.
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True
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Ornithopods are not known to have been herding animals.
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False
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Hadrosaurs may have had inflatable air sacs over the flat dorsal portion of the skull surrounding the external nostrils.
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True
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Circumnarial depressions surrounding the nasal opening of hadrosaurines were:
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Probably covered by an inflatable skin sack
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Which of the following hadrosaurs was named after a Canadian city?
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Edmontosaurus
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All ornithopods were quadrupedal.
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False
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Othnielia, a small member of the Hypsilophodontidae family of ornithopods, was named in honor of a famous dinosaur paleontologist, being named for the first name of _______.
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Marsh
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Which of the following about hadrosaurs is false?
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They have a single tooth row of large teeth on each side of the jaw.
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The so-called duck-billed hadrosaurs were restricted to the Jurassic Period.
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False
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This genus of ornithopods is the type genus of an early family and clade of ornithopods and derives its name from the fact that it has different types of teeth.
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Heterodontosaurus
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Computer simulations have been made of the sound once produced by the long hollow crest of this hadrosaur.
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Parasaurolophus
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Which statement about the Iguanodontia is false?
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They had small external nostrils
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Ossified or bony tendons in the tails of many ornithopods served to _____.
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Stiffen the tail
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Ornithopods were remarkably diverse and distributed throughout the world.
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True
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Lambeosaurus was a large, duck-billed dinosaur with a bony head crest shaped like a hatchet.
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True
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The crests of lambeosaurines varied in species according to age and sex.
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True
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The genus from the large Euornithopoda clade was bipedal, only 2-5 meters long, and exhibited the specialized chewing arrangement of more advanced ornithopods.
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Hypsilophodon
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Which of the following dinosaurs had batteries of large numbers of teeth organized into large rasping surfaces?
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Hadrosauridae
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This member of the Iguanodontia is intermediate in size between Dryosaurus and Iguanodon.
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Camptosaurus
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The ability of ornithopods to chew on both sides of the mouth at the same time is referred to as:
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Bilateral occlusion
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Which of the following plant eaters depended least on spines or plates for defense?
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Ornithopods
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Most ornithopods chewed their food by allowing the upper and lower teeth to shear past each other in a chewing mechanism called:
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Pleurokinesis
