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Ornithomimids
Temporal range: Late Cretaceous,[1] 92–66 Ma
Ornithomimus edmontonicus.jpg
Ornithomimus specimen found in 1995 with quill knobs, Royal Tyrrell Museum.
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Clade: Ornithomimosauria
Superfamily: Ornithomimoidea
Family: Ornithomimidae
Marsh, 1890
Type species
Ornithomimus velox
Marsh, 1890
Subgroups[3]
Synonyms
  • Struthiomimidae Osborn, 1972

Ornithomimidae (meaning "bird-mimics") is a group of theropod dinosaurs which bore a superficial resemblance to modern ostriches. They were fast, omnivorous or herbivorous dinosaurs from the Cretaceous Period of Laurasia (now Asia and North America). The group first appeared in the Late Cretaceous.

Description[edit]

The skulls of ornithomimids were small, with large eyes, above relatively long and slender necks. All had toothless beaks.

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. Ornithomimids were probably among the fastest of all dinosaurs.[1] Like many other coelurosaurs, the ornithomimid hide was feathered rather than scaly.

Biology[edit]

Comparisons between the scleral rings of the genus Ornithomimus and modern birds and reptiles indicate that they may have been cathemeral, active throughout the day at short intervals.[4]

While little is known of ornithomimid reproduction, neonate ornithomimid fossils have been found representing either embryos or hatchlings.[5]

Ornithomimids appear to have been preyed upon at least occasionally by other theropods, as evidenced by an ornithomimid tail vertebra that preserves tooth drag marks attributed to a dromaeosaurid (Saurornitholestes).[6] One specimen from an unidentified ornithomimid shows a pathologic toe bone whose far end is "mushroomed" compared to those of healthy specimens.[7]

Diet[edit]

Ornithomimids probably acquired most of their calories from plants. Many ornithomimosaurs, including primitive species, have been found with numerous gastroliths in their stomachs, characteristic of herbivores. Henry Fairfield Osborn suggested that the long, sloth-like 'arms' of ornithomimids may have been used to pull down branches on which to feed, an idea supported by further study of their strange, hook-like hands.[8] The sheer abundance of ornithomimids — they are the most common small dinosaurs in North America — is consistent with the idea that they were plant eaters, as herbivores usually outnumber carnivores in an ecosystem. However, they may have been omnivores that ate both plants and small animal prey.

The feeding habits of ornithomimids have been controversial. In 2001 Norell et al. reported a specimen of Gallimimus (IGM 100/1133) and one of Ornithomimus (RTMP 95.110.1). These two fossil skulls had soft tissue preservation, and both had keratinous beaks with vertical grooves extending ventrally from the bony upper mandible. These structures are reminiscent of the lamellae seen in ducks, in which they function to strain small edible items like plants, forams, mollusks, and ostracods from the water. The authors further noted that ornithomimids were abundant in mesic environments, and rarer in more arid environments, suggesting that they may have depended on waterborne sources of food, possibly filter feeding. They noted that primitive ornithomimids had well developed teeth, while derived forms were edentulous and probably could not feed on large animals.[9]

One later paper questioned the conclusions of Norell et al. Barrett (2005) noted that vertical ridges are seen on the inner surface of the beaks of strictly herbivorous turtles, and also the hadrosaurid Edmontosaurus. Barrett also offered calculations, estimating how much energy could be derived from filter feeding and the probable energy needs of an animal as big as Gallimimus. He concluded that herbivory was more likely. [10]

Classification[edit]

Named by O.C. Marsh in 1890, the family Ornithomimidae was originally classified as a group of ornithopods. Two years later, Marsh described additional material and realized that ornithomimids were theropods. As relationships within theropods began to be resolved in the 20th century, Friedrich von Huene included Ornithomimidae in his infraorder Coelurosauria. Recognizing the distinctivness of ornithomimids compared to other coelurosaurs, Rinchen Barsbold placed ornithomimids within their own infraorder, Ornithomimosauria, in 1976. Today, Ornithomimosauria is regarded as a clade within Coelurosauria. The contents of Ornithomimidae and Ornithomimosauria varied from author to author as cladistic definitions began to appear for the groups in the 1990s and 2000s.

The cladogram below was the result of a study conducted in 2015 by Claudia Serrano-Branas and colleagues.[3]

Ornithomimidae

Archaeornithomimus asiaticus


unnamed

Sinornithomimus dongi


unnamed


Anserimimus planinychus



Gallimimus



unnamed

Struthiomimus


unnamed

Tototlmimus packardensis



Ornithomimus







See also[edit]

References[edit]

  1. ^ a b Holtz, Thomas R. Jr. (2012) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2011 Appendix.
  2. ^ Xu, L.; Kobayashi, Y.; Lü, J.; Lee, Y. N.; Liu, Y.; Tanaka, K.; Zhang, X.; Jia, S.; Zhang, J. (2011). "A new ornithomimid dinosaur with North American affinities from the Late Cretaceous Qiupa Formation in Henan Province of China". Cretaceous Research. 32 (2): 213. doi:10.1016/j.cretres.2010.12.004. 
  3. ^ a b Serrano-Brañas, Claudia Inés; Torres-Rodríguez, Esperanza; Reyes-Luna, Paola Carolina; González-Ramírez, Ixchel; González-León, Carlos (2015). "A new ornithomimid dinosaur from the Upper Cretaceous Packard Shale formation (Cabullona Group) Sonora, México". Cretaceous Research. 58: 49. doi:10.1016/j.cretres.2015.08.013. 
  4. ^ Schmitz, L. & Motani, R. (2011). "Nocturnality in Dinosaurs Inferred from Scleral Ring and Orbit Morphology". Science. 332 (6030): 705–8. Bibcode:2011Sci...332..705S. doi:10.1126/science.1200043. PMID 21493820. 
  5. ^ Tanke, D.H. and Brett-Surman, M.K. 2001. Evidence of Hatchling and Nestling-Size Hadrosaurs (Reptilia:Ornithischia) from Dinosaur Provincial Park (Dinosaur Park Formation: Campanian), Alberta, Canada. pp. 206–218. In: Mesozoic Vertebrate Life—New Research Inspired by the Paleontology of Philip J. Currie. Edited by D.H. Tanke and K. Carpenter. Indiana University Press: Bloomington. xviii + 577 pp.
  6. ^ Jacobsen, A.R. 2001. Tooth-marked small theropod bone: An extremely rare trace. p. 58-63. In: Mesozoic Vertebrate Life. Ed.s Tanke, D. H., Carpenter, K., Skrepnick, M. W. Indiana University Press.
  7. ^ Molnar, R. E., 2001, Theropod paleopathology: a literature survey: In: Mesozoic Vertebrate Life, edited by Tanke, D. H., and Carpenter, K., Indiana University Press, p. 337-363.
  8. ^ Nicholls, E. L.; Russell, A. P. (1985). "Structure and function of the pectoral girdle and forelimb of Struthiomimus altus (Theropoda: Ornithomimidae)". Palaeontology. 28: 643–677. 
  9. ^ Norell, M. A.; Makovicky, P.; Currie, P. J. (2001). "The beaks of ostrich dinosaurs". Nature. 412 (6850): 873–874. Bibcode:2001Natur.412..873N. doi:10.1038/35091139. PMID 11528466. 
  10. ^ Barrett, P. M. (2005). "The diet of ostrich dinosaurs (Theropoda: Ornithomimosauria)". Palaeontology. 48 (2): 347–358. doi:10.1111/j.1475-4983.2005.00448.x. 

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