Dinosauria is a superorder that comes under reptilia, which contains all known dinosaurs in the world. Dinosauria is divided into two groups namely Saurischia and Ornithischia based on the anatomy of Pelvic girdle (hip). This division is put forward by a British scientist named Harry Seeley in 1887. Saurichians are known as ‘Lizard hipped’ and Ornithischians as ‘Bird hipped’ dinosaurs.
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Ancoracysta twista does not fit with any known group of organisms but appears to belong to an early lineage of eukaryote that was previously unknown. The unusually large number of genes in its mitochondrial genome opens a window into the early evolution of eukaryotic organisms.