Tampilkan Grafik. Ornithischians have a reversed pubis, which points toward the tail and lies alongside and parallel to the ischium. Additionally, some ornithischians have a projection at the forward end of the pubis. Ulasan Kurator. The Dinosauria contains two major groups of dinosaurs: the Ornithischia , or "bird-hipped" dinosaurs, and the Saurischia , or "lizard-hipped" dinosaurs.
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