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Lecture 13

01:460:206 Lecture Notes - Lecture 13: Psittacosaurus, Ceratopsidae, Triceratops


Department
Geological Sciences
Course Code
01:460:206
Professor
L.Adamo
Lecture
13

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Ch 14 The Last Ornithischians: Ceratopsians and the Peculiar Pachycephalosaurus
Ceratopsia
Psittacosauridae
o Psittacosaurus
Ceratopsidae
o Triceratops
Frill: shelf of bone on back of skull
Psittacosaurus parrot dinosaur
o Cheek-teeth battery
o Rudimentary frill
o High nostrils
o Flaring cheeks
Primitive Marginocephalian bipedal
o Forelimb three functional toes
o Hindlimb four slender toes
Ceratopsidae
o Large head
o Bone frill
o Pointed Knee
o Evolved into obligate quadrupedal
o Hollow part in skull
o Lighten frame
o Elaborate frills
o Large nostrils
o Heavily built
o Fused backbone and hip
o Deep rib cage
o Quadrupedal
Triceratops three horned face
Upright or sprawling ceratopsians
Defense
Eating
o Heavy muscles anchored for chewing
o Cheek teeth battery
o Herbivores
Sexual dimorphism
o Morphological difference between male and female of one species
o Nests, death
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