extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans); bone-headed and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods).

• 长有鸟状骨盆的陆地爬虫动物，现已灭绝；甲壳恐龙；鸭嘴恐龙。