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Definition:
extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans); bone-headed and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods)
Your choice?
- order platyctenea (Definition: an order of Tentaculata)
- order polypodiales (Definition: true (leptosporangiate) ferns)
- order proteales (Definition: coextensive with the family Proteaceae)
- order ornithischia
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