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Lecture 12

01:460:206 Lecture Notes - Lecture 12: Heterodontosauridae, Hypsilophodont, Nodosauridae


Department
Geological Sciences
Course Code
01:460:206
Professor
L.Adamo
Lecture
12

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o Not fast runners and could not rear up on hindlimbs
o Wide armored heads w/ horns at posterior corners
Anklosauria
o Originally proposed they ate ants
o Fossil remains have found plant material in mouths
o Broad snouts suggests they were not picky eaters
o Leaf-shaped, non-interlocking teeth
o Similar to modern plant eating reptiles
o Wear on teeth shows they grinded food in mouth
Tail club
o Passive defense, hit theropods with tail bone
Complex nasal passages
Medium-large sized 9 meters
Nodosauridae
o Lacked horns at corner of skull
o Entire body covered w/ regular bands of bony plats or nodules
o No tail club
Chapter 13
Ornithopods
o Mouth
o Premaxilla bone (front bone of the upper jaw)
o Over hangs the maxilla bone (second bone in the upper jaw)
o Jaw joint is farther down than other dinos = beak” and powerful bite
o Flower plants evolved
o Cretaceous period
o Grass specialized for eating them
Five families
o Heterodontosauridae
Incisors
Fang (tusks)
Display, digging for food
Molar
Differentiated teeth
o Hypsilophodontidae
Horn covering
Premaxilla
Preclentary
Cheek teeth blades
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