gly 1102 topic 28

Ceratopsians were very social animals, some travelling in large groups or herds of 1000 or more individuals.
true
Ceratopsians do not display sexual dimorphism.
false
Pentaceratops have 5 significant horns–2 horns are forward-pointing over the orbits, another a nasal horn, and 2 protruding cheekbone horns.
true
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.
true
Chasmosaurus has two very large openings (parietal fenestra) in the frill.
true
Whereas Psittacosaurus has only a small rudimentary frill, the Protoceratopsidae display a much larger bony frill that extended back over the neck.
true
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Ceratopsians became very abundant in the Late Cretaceous, especially in North America.
true
The Neoceratopsia is comprised of 2 families, the smaller Protceratopsidae and the Ceratopisdae.
true
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.
true
The Ceratopsia (“horned faces”) includes a relatively large group of some 20 genera, mostly from the Upper Cretaceous of North America.
true
Ceratopsians are ornithiscian dinosaurs and are closely related to ornithopods, both being plant-eating ornithiscians.
true
Triceratops was the smallest of the ceratopsians.
false
As is the case with Psittacosauridae, the Protoceratopsidae have no nasal or post-orbital horns, just a thickened bump in front of the orbit.
true
Centrosaurus have 6 long, bony spikes sticking out fanwise from the back of its frill.
false
Protoceratops has no horns (nasal or post-orbital) and the nostrils are much larger than the Ceratopsidae.
false
Psittacosaurus is the basal member of the ceratopsian clade and the only member of the Psittacosauridae.
true
All ceratopsians had horns on their skull.
false
The Ceratopsidae are all large, habitually bipedal, with very large skulls, large nostrils, very prominent frills, and a variety of horns.
false
The margins of some ceratopsian frills had extra bones called
epoccipitals
Centrosaurus has 2 large frill openings (parietal fenestra) with a parietal strut dividing them.
true
The Neoceatopsia were obligate bipedals.
false
Psittacosaurus is the basal member of the ceratopsian clade and the only member of the Psittacosauridae.
true
All ceratopsians had a relatively large frill.
false
While the Protoceratopsidae were bipedal, the Psittacosaurus were clearly an obligate quadrupedal.
false
The frill is a shelf of bone projecting from the back of the skull.
true