GLY1102 Topic 28
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Psittacosaurus is the basal member of the ceratopsian clade and the only member of the Psittacosauridae.
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True
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Protoceratops bears the distinction of being one of the first dinosaurs for which specimens were found of a range ages, probably of each sex.
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True
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Ceratopsians do not display sexual dimorphism.
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False
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Triceratops was the smallest of all ceratopsians.
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False
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Pentaceratops has five significant horns—two horns are forward pointing over the orbits, another a nasal horn, and two protruding cheekbone horns.
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True
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Centrosaurus has two large frill openings (pariental fenestra) with a parietal strut dividing them.
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True
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The Ceratopsidae are all large, habitually bipedal, with very large skulls, large nostrils, very prominent frills, and a variety of horns.
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False
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As is the case with the Psittacosauridae, the Protoceratopsidae have no nasal or post-orbital horns, just a thickened bump in front of the orbit.
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True
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Ceratopsians were very social animals, some traveling in large groups or herds of 1000 or more individuals.
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True
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The Neoceatopsia were obligate bipedals.
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False
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Ceratopsians became very abundant in the Late Cretaceous, especially in North America.
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True
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All ceratopsians had horns on their skull.
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False
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Ceratopsians are ornithischian dinosaurs and are closely related to ornithopods, both being plant-eating ornithischians.
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True
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Protoceratops has no horns (nasal or post-orbital) and the nostrils are much larger than the Ceratopsidae.
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False
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The frill is a shelf of bone projecting from the back of the skull.
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True
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The Neoceratopsia is comprised of two families, the smaller Protoceratopsidae and the Ceratopsidae.
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True
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A bony shelf on the back of the skull unites this group called the ______.
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Marginocephalia
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The margins of some ceratopsian frills had extra bones called ______.
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Epoccipitals
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The Ceratopsia (\"horned faces\") includes a relatively large group of some 20 genera, mostly from upper cretaceous of North America.
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True
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Pachyrhinosaurus is a memorable ceratopsian of about 6m in length, with a short beak, and a low face with masses of very roughened bone that extend the length of the snout from the nose to eyes.
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True
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Whereas Psittacosaurus has only a small rudimentary frill, the Protoceratopsidae display a much larger bony frill that extended back over the neck.
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True
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All ceratopsians had a relatively large frill.
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False
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Chasmosaurus has two very large openings (parietal fenestra) in the frill.
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True
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While the Protoceratopsidae were bipedal, the Psittacosaurus were clearly an obligate quadrupedal.
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False
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Centrosaurus has six long, bony spikes sticking out fanwise from the back of its frill.
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False
