Struthiomimus (meaning "ostrich mimic", from the Greek στρουθιον/strouthion meaning "ostrich" and μιμος/mimos meaning "mimic" or "imitator") is a genus of ornithomimid dinosaur from the late Cretaceous of Alberta, Canada. It was a long-legged, ostrich-like dinosaur.
The bipedal Struthiomimus stood about 4.3 meters long (14 ft) and 1.4 meters (4.6 ft) tall at the hips and weighed around 150 kilograms (330 lb). Struthiomimus is one of the more common small dinosaurs in the Dinosaur Provincial Park; its abundance suggests that it was a herbivore or omnivore rather than a carnivore.
Like many other dinosaur genera discovered in the 1800s, the history of Struthiomimus is convoluted. The first known fossils of Struthiomimus were named Ornithomimus sedens by Othniel Charles Marsh in 1892, and a subsequent species was named O. altus by Lawrence Lambe in 1902. It wasn't until 1917 that Henry Fairfield Osborn named Struthiomimus from fossils discovered in 1914 from the Red Deer River site in Alberta.
Struthiomimus had long slender arms and hands, with immobile forearm bones but limited opposability between the first finger and the other two. It had the longest hands of any ornithomimid, with particularly long claws. The three fingers were roughly the same length, and the claws were only slightly curved; Henry Fairfield Osborn, describing a skeleton in 1917, compared the arm to that of a sloth. Its shin was longer than its thigh, a cursorial feature. Among ornithomimids, though, its legs were only moderately elongate. Its feet were elongate, and the metatarsals were tightly appressed, with three toes tipped by claws with very slight curvature.
In 1901, Lawrence Lambe found some incomplete remains and named them Ornithomimus altus, placing them in the same genus as material earlier described by Othniel Charles Marsh in 1890. The specific name altus is from Latin, meaning "lofty" or "noble". However, in 1914, a nearly complete skeleton was discovered by Barnum Brown at the Red Deer River site in Alberta, and officially described as the separate genus Struthiomimus by Henry Fairfield Osborn in 1917.
Struthiomimus altus comes from the Late Campanian (Judithian age) Dinosaur Park Formation. A species of Struthiomimus is also known from the Late Campanian/Early Maastrichtian (Edmontonian age) Horseshoe Canyon Formation. Because dinosaur fauna show rapid turnover, it is possible that these younger Struthiomimus specimens will prove to be a species distinct from S. altus, though no new name has been given to them. Struthiomimus specimens from the Hell Creek Formation are larger (similar to Gallimimus in size) and tend to have straighter and more elongate hand claws, similar to those seen in Ornithomimus. They most likely represent a separate species of Struthiomimus, named Struthiomimus sedens (again, originally named as a species of Ornithomimus by Marsh, in 1892).
}} }} }} }} }} The cladogram presented here follows the one recovered by Turner, Clarke, Ericson and Norell, 2007. Clade names follow definitions provided by Sereno, 2005.
Just as the fossil remains of Struthiomimus were incorrectly assigned to Ornithomimus, the superfamily that Struthiomimus belongs to, the Ornithomimosauria, also underwent many changes over the years. For example, O.C. Marsh initially included Struthiomimus in the Ornithopoda, a large clade of dinosaurs not closely related to theropods. Five years later, Marsh classified Struthiomimus in the Ceratosauria. In 1891, Baur placed the genus within Iguanodontia. As late as 1993, Struthiomimus was referred to Oviraptorosauria. However, by the 1990s, there were numerous studies that placed Struthiomimus within Coelurosauria.
Recognizing the difference between ornithomimids and other theropods, Rinchen Barsbold placed ornithomimids within their own infraorder, Ornithomimosauria, in 1976. The constituency of Ornithomimidae and Ornithomimosauria varied with different authors. Paul Sereno, for example, used Ornithomimidae to include all ornithomimosaurians in 1998, but subsequently changed to a more exclusive definition (advanced ornithomimosaurs) within Ornithomimosauria, a classification scheme that was adopted by other authors at the beginning of the current century.
There has been much discussion about the feeding habits of Struthiomimus. Because of its straight-edged beak, Struthiomimus may have been an omnivore. Some theories suggest that it may have been a shore-dweller and may have been a filter feeder. Some paleontologists noted that it was more likely to be a carnivore because it is classified within the otherwise carnivorous theropod group. This theory has never been discounted, but Osborn, who described and named the dinosaur, proposed that it probably ate buds and shoots from trees, shrubs and other plants, using its forelimbs to grasp branches and its long neck to enable it accurately to select particular items. This herbivorous diet is further supported by the unusual structure of its hands. The second and third fingers were of equal length, could not function independently, and were probably bound together by skin as a single unit. This indicates that the hand was used as a "hook", for bringing branches or fern fronds within reach.
Early restorations depict a posture reminiscent of the "walking tripod" postures of Tyrannosaurus and Iguanodon, before the later, more balanced depictions with stiffened horizontal tails and bodies were widely accepted. This newer view creates an image much more reminiscent of modern flightless birds, such as the ostrich to which this dinosaur's name refers.
Struthiomimus has appeared in several dinosaur-related films and television programs, such as the egg-napping villains in The Land Before Time II: The Great Valley Adventure. They played a prominent role in the Disney animated film Dinosaur, and in 1985, Struthiomimus was featured in Dinosaur!, a CBS television documentary hosted by Christopher Reeve. In a stop-motion animation sequence, a Struthiomimus was shown feeding on hadrosaurid eggs and escaping the angry mother, only to be preyed upon by a pair of Deinonychus moments later (though in reality, Deinonychus lived in the early Cretaceous Period and was not a contemporary of Struthiomimus). Struthiomimus'' toys were included in the Dino-Riders line by Tyco and was later re-released in the Smithsonian toy line.
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