Struthiomimus altus (Osborn 1917, Late Cretaceous, 4.3m, AMNH 5339) is one of the ostrich-mimic theropod dinosaurs. In the large reptile tree it is derived from a sister to Compsognathus and basal to the Tyrannosaurus clade, including the four-winged 'bird', Microraptor.

Overall much larger than Compsognathus, Struthiomimus had a relatively smaller and toothless skull. The cervicals were longer, the torso was shorter with fewer vertebrae. Pedal digit 1 is absent. The middle (third) metatarsal was proximally pinched by the second and fourth metatarsals.

Garudimimus brevipes (Barsbold 1981; Late Cretaceous, 90mya) is known from one incomplete skeleton. It nests with Strutiomimus (above) in the LRT. The ventral margin of the long maxilla is straight. What Barsbold identified as digit 1 is probably distal digit 3 based on phylogenetic bracketing.

Gallimimus bullatus (Osmólska, Roniewicz & Barsbold, 1972, Late Cretaceous) is the largest ostrich-mimic theropod dinosaurs.

not Shuvuuia deserti (IGM 100/0977; Chiappe et al. 1998) was originally considered a member of the genus Shuvuuia based on its stunted forelimb with a large ungual 1. In the LRT it nests as a small sister to Gallimimus.

Barsbold R 1981. Toothless carnivorous dinosaurs of Mongolia. Transactions, Joint Soviet–Mongolian Palaeontological Expedition (in Russian). 15: 28−39.

Osborn HF 1917. Skeletal adaptations of Ornitholestes, Struthiomimus, Tyrannosaurus. Bulletin of the American Museum of Natural History 35: 733–771.

Osmolska H, Roniewicz E and Barsbold R 1972. A new dinosaur, Gallimimus bullatus N. gen. N. sp. (Ornithomimidate) from the Upper Cretaceous of Mongolia.

wiki/Struthiomimus
wiki/Gallimimus
wiki/Garudimimus