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6 Cards in this Set
- Front
- Back
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Order Ornithopoda
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Earliest (early Jurassic)
More diverse order Bipedal (but not otherwise very similar) All other ornithischians come from No gastroliths, more sophisticated teeth Features: overbite from offset tooth row, lower jaw joint, bipedal |
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Family Fbrosauridae (
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Small plant eaters
Fabrosaurus - 4-5 feet long - early Jurassic - no specializations - most primitive |
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Family Heterodontosauridae (different toothed)
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Small plant eaters
Heterodontosaurus - early-middle Jurassic - unusual teeth, similar to pig, used to dig up or rip food - only dinosaur with multiple kinds of teeth - dental battery (densely packed teeth) |
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Family Hypsolophodontidae (high ridged or ctrested teeth)
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Hypsilophodon
- mid Jurassic-early Cretaceous - 6-15 feet - extremely long hind limbs and feet - beak, no teeth in front |
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Family Iguanodontidae
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Iguanodon
- spike-like thumb - 15-30 feet - sometimes quadrapedal - much heavier and massive than Hypsilophodon - longer skull, horse-like snout - dental battery - late Jurassic-early Cretaceous Ouranosaurus (brave reptile) - middle Cretaceous - extended neural spines (hump back) |
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Family Hadrosauridae (heavy reptile)
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Some crested, some not
Group is extremely diverse Bipedal No spiked thumb Middle-late Cretaceous (late of Ornithopods) Most successful of Ornithopods Hadrosaurus/Duck-bill - not crested a (horned face) Early Cretaceous, most at end of Cretaceous Dental battery |
