Ornithomimosauria

Ornithomimosauria is a clade of mostly bipedal theropod dinosaurs, including ostrich-like forms, that lived from the Early Cretaceous to the end of the Cretaceous.

Theropoda: Theropoda is a dinosaur group that includes birds and their extinct relatives, typically characterized by bipedal posture. Ornithomimosaurs are nested within this major dinosaur group.
Cursoriality: Cursoriality is anatomical and behavioral specialization for sustained movement on land. Long legs and bipedal posture are central to interpretations of ornithomimosaur locomotion.
Ornithomimus: Ornithomimus is a Late Cretaceous North American genus of ostrich-like theropod dinosaur. It is the namesake genus and one of the best-known ornithomimosaurs.
Nqwebasaurus: Nqwebasaurus is an Early Cretaceous theropod from South Africa often classified among the earliest ornithomimosaurs. Its placement bears on how early the clade appeared and whether it originated outside the Northern Hemisphere.
Therizinosauria: Therizinosauria is a clade of theropod dinosaurs including herbivorous forms with long necks and large claws. Its unusual herbivorous members offer a contrast to the more gracile, ostrich-like ornithomimosaurs.
Maniraptora: Maniraptora is a theropod clade that includes birds and several close extinct relatives. Its evolutionary relationships help place ornithomimosaurs among coelurosaurian theropods.
Beak: A beak is a hard, keratin-covered structure at the front of the jaws in birds and some other animals. Toothless jaws in many derived ornithomimosaurs formed a beak-like feeding structure.
Struthiomimus: Struthiomimus is a Late Cretaceous North American genus of long-legged ornithomimosaur. Its well-known fossils offer a close comparison with Ornithomimus.
Pelecanimimus: Pelecanimimus is an Early Cretaceous ornithomimosaur from Spain, notable for numerous small teeth. Its early age and unusual dentition show that derived toothlessness came later in some lineages.
Alvarezsauridae: Alvarezsauridae is a clade of small, specialized theropod dinosaurs, many with short arms and enlarged digging claws. Both are derived coelurosaurs, but alvarezsaurs evolved a markedly different body plan.

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