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ARCHAEORNITHOMIMUS

an ornithomimid (bird mimic) theropod dinosaur from the Late Cretaceous of Asia.
archaeornithomimus.png
Pronunciation: AH-kee-or-NITH-o-MIEM-us
Meaning: Ancient bird mimic
Author/s: Russell (1972)
Synonyms: Ornithomimus asiaticus
First Discovery: Nei Mongol, China
Chart Position: 180

Archaeornithomimus asiaticus

Archaeornithomimus was initially assigned to Ornithomimus as Ornithomimus asiaticus by Charles Whitney Gilmore in 1933, ten years after its discovery by Peter Kaisen, mostly in a Mongolian Quarry that now bears his name. Its current name—meaning "ancient Ornithomimus"—was bestowed in 1972 by Dale Russel because he thought it was the most ancient of the ornithomimids ("bird mimics"). Unfortunately, Kaisen Quarry had been grossly misdated and this critter isn't nearly as archaic as once presumed.

Around 3.5 meters long and maybe 80kg in weight, Archaeornithomimus has rather robust hind legs and contrary to initial reports it does sport an arctometatarsus as found in all of its relatives barring Garudimimus and Harpymimus. Also present in troodontids, tyrannosauroids and caenagnathids, this design — where the middle of three metatarsals (the bones that join the toes to the ankle) is "pinched" by the flanking two — is generally regarded as an adaptation for swift running, but ornithomimids were probably the swift-runniest dinosaurs of them all.
(Ancient Bird Mimic of Asia)Etymology
Archaeornithomimus is derived from the Greek "arkhaios" (ancient), "Ornith" (bird) and "mimos" (mimic). Specifically, it means Ancient Ornithomimus.
The species epithet, asiaticus, refers to its discovery in Asia.
Discovery
The remains of Archaeornithomimus were discovered at Kaisen Quarry in the Iren Dabasu Formation, Nei Mongol (Inner Mongolia), Peoples Republic of China, by Peter Kaisen during a Roy Chapman Andrews-led American Museum of Natural History expedition in 1923.
A holotype was never assigned so David Smith and Peter Galton nominated a foot (AMNH 6565) as lectotype in 1990.
Estimations
Timeline:
Era: Mesozoic
Epoch: Late Cretaceous
Stage: Campanian
Age range: 84-71 mya
Stats:
Est. max. length: 3.5 meters
Est. max. hip height: 1.8 meters
Est. max. weight: 80 Kg
Diet: Omnivore
References
• C. W. Gilmore (1933) "On the dinosaurian fauna of the Iren Dabasu Formation".
Bulletin of the AMNH, v.67, article 2.
• Russell, D. A. (1972) "Ostrich dinosaurs from the Late Cretaceous of Western Canada".
Canadian Journal of Earth Sciences, 1972, 9(4): 375-402, 10.1139/e72-031.
• David Smith and Peter Galton (1990) "Osteology of Archaeornithomimus asiaticus (Upper Cretaceous, Iren Dabasu Formation, People's Republic of China)".
Journal of Vertebrate Paleontology 10(2):255-265
• L.M. Chiappe (2007) "Glorified Dinosaurs: The Origin and Early Evolution of Birds".
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To cite this page:
Atkinson, L. "ARCHAEORNITHOMIMUS :: from DinoChecker's dinosaur archive".
›. Web access: 23rd Mar 2017.
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