GLY1102 Topic 28

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