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6 Cards in this Set

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  • Back
Order Ornithopoda
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
Family Fbrosauridae (
Small plant eaters
Fabrosaurus
- 4-5 feet long
- early Jurassic
- no specializations
- most primitive
Family Heterodontosauridae (different toothed)
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)
Family Hypsolophodontidae (high ridged or ctrested teeth)
Hypsilophodon
- mid Jurassic-early Cretaceous
- 6-15 feet
- extremely long hind limbs and feet
- beak, no teeth in front
Family Iguanodontidae
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)
Family Hadrosauridae (heavy reptile)
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