14-marginocephailians

14-marginocephailians - Function of frills horns Ceratopsia...

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460:206 DINOSAURS The Last Ornithischians: Ceratopsians and the Peculiar Pachycephalosaurs Marginocephalia
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Psittacosauridae Homalocephalidae 1. 2. 3. 4. A. B. C. Pachycephalosauridae Ceratopsidae 5. 6.
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Marginocephalia Ceratopsia Pachycephalosauria Cretaceous Period
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Ceratopsia Psittacosauridae Psittacosaurus Ceratopsidae Triceratops Frill : shelf of bone on back of skull
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Psittacosaurus “parrot dinosaur” Cheek-teeth battery High nostrils Rudimentary frill Flaring cheeks
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Psittacosaurus 2 meters in length Forelimb : three functional toes Hindlimb : four slender toes Primitive Marginocephalian- Bipedal
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Psittacosaurus
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Ceratopsia Psittacosauridae Psittacosaurus Ceratopsidae Triceratops
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Ceratopsidae Large head Broad frill Pointed keel Evolved into Obligate quadrupedal*
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Ceratopsidae
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Ceratopsidae Elaborate frills Large nostrils
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Ceratopsidae Heavily built Deep rib cage Fused backbone and hip Quadrupedal
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Triceratops “Three-horned face” How many species?
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Ceratopsia Small – large body sizes 1 – 8 meters long
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Ceratopsia
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Ceratopsia
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Ceratopsidae
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Unformatted text preview: Function of frills, horns? Ceratopsia Defense Ceratopsia Heavy muscles anchored for chewing Ceratopsia Cheek-teeth battery herbivores Ceratopsia Display Ceratopsidae Sexual Dimorphism Morphological difference between male and female of one species Ceratopsia Marginocephalia Ceratopsia Pachycephalosauria Pachycephalosauria Homalocephalidae Homalocephale Pachycephalosauridae Stegoceras Thickened skull roof thick headed reptile Pachycephalosauria Homalocephalidae Homalocephale Low skull dome Pachycephalosauridae Thickened skull roof Solid bone! High skull dome Pachycephalosauridae Head-butting Predators, threats Other Pachys (rams or goats) Pachycephalosauridae Thickened skull Short and wide cranial base Angle of skull locked vertebrae enforced hip socket Pachycephalosauridae Bipedal locomotion Forelimbs shorter than hindlimbs Pachycephalosauridae Medium large body sizes 2 10 meters...
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  • Spring '11
  • neitzke
  • Cretaceous Period Pachycephalosauria Ceratopsia, Psittacosaurus Ceratopsidae Triceratops, Psittacosauridae Psittacosaurus Ceratopsidae

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14-marginocephailians - Function of frills horns Ceratopsia...

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