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Concept
Ornithomimosauria
Summary
Automatic taxobox
| name = Ornithomimosaurs
| fossil_range = Cretaceous,
| image = Ornithomimosauria Diversity.jpg
| image_upright = 1.15
| image_caption = Collection of seven ornithomimosaurs, clockwise from top left: Gallimimus, Anserimimus, Ornithomimus, Deinocheirus, Harpymimus, Struthiomimus and "Gallimimus mongoliensis"
| taxon = Ornithomimosauria
| authority = Barsbold, 1976
| subdivision_ranks = Subgroups
| subdivision = *Haplocheirus?
Nedcolbertia
Nqwebasaurus
Thecocoelurus?
Valdoraptor?
Macrocheiriformes Cuesta et al., 2021
Harpymimus
Pelecanimimus
Shenzhousaurus
Ornithomimoidea Marsh, 1890
Arkansaurus
Hexing
Kinnareemimus
Deinocheiridae
Ornithomimidae
| synonyms = *Deinocheirosauria Barsbold, 1976
Arctometatarsalia Holtz, 1994
Ornithomimosauria ("bird-mimic lizards") are theropod dinosaurs which bore a superficial resemblance to the modern-day ostrich. They were fast, omnivorous or herbivorous dinosaurs from the Cretaceous Period of Laurasia (now Asia, Europe and North America), as well as Africa and possibly Australia. The group first appeared in the Early Cretaceous and persisted until the Late Cretaceous. Primitive members of the group include Nqwebasaurus, Pelecanimimus, Shenzhousaurus, Hexing and Deinocheirus, the arms of which reached 2.4 m (8 feet) in length. More advanced species, members of the family Ornithomimidae, include Gallimimus, Struthiomimus, and Ornithomimus. Some paleontologists, like Paul Sereno, consider the enigmatic alvarezsaurids to be close relatives of the ornithomimosaurs and place them together in the superfamily Ornithomimoidea (see classification below).
The skulls of ornithomimosaurs were small, with large eyes, above relatively long and slender necks. The most basal members of the taxon (such as Pelecanimimus and Harpymimus) had a jaw with small teeth, while the later and more derived species had a toothless beak. The fore limbs ("arms") were long and slender and bore powerful claws. The hind limbs were long and powerful, with a long foot and short, strong toes terminating in hooflike claws.
Official source
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