gly 1102 topic 28
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Ceratopsians were very social animals, some travelling in large groups or herds of 1000 or more individuals.
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true
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Ceratopsians do not display sexual dimorphism.
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false
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Pentaceratops have 5 significant horns--2 horns are forward-pointing over the orbits, another a nasal horn, and 2 protruding cheekbone horns.
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true
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Pachyrhinosaurus is a memorable ceratopism of about 6 m in the 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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Chasmosaurus has two very large openings (parietal fenestra) in the frill.
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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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Ceratopsians became very abundant in the Late Cretaceous, especially in North America.
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true
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The Neoceratopsia is comprised of 2 families, the smaller Protceratopsidae and the Ceratopisdae.
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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 of ages, probably of each sex.
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true
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The Ceratopsia (\"horned faces\") includes a relatively large group of some 20 genera, mostly from the Upper Cretaceous of North America.
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true
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Ceratopsians are ornithiscian dinosaurs and are closely related to ornithopods, both being plant-eating ornithiscians.
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true
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Triceratops was the smallest of the ceratopsians.
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false
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As is the case with 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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Centrosaurus have 6 long, bony spikes sticking out fanwise from the back of its frill.
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false
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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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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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All ceratopsians had horns on their skull.
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false
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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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The margins of some ceratopsian frills had extra bones called
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epoccipitals
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Centrosaurus has 2 large frill openings (parietal fenestra) with a parietal strut dividing them.
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true
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The Neoceatopsia were obligate bipedals.
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false
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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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All ceratopsians had a relatively large frill.
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false
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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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The frill is a shelf of bone projecting from the back of the skull.
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true
