Smaller than a Microraptor!

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An artist's illustration of Dromiceiomimus brevitertius
Scientific classification
Kingdom: Animalia
Phylum: Chordata
clade: Ornithomimosauria
Order: Saurischia
Suborder: Theropoda
Family: Ornithomimidae
Genus: Dromiceiomimus
Russell, 1972
Referred species
  • Dromiceiomimus brevitertius (Parks, 1926) (type)

Dromiceiomimus was an Ornithomimosaur of the late Cretaceous (early Maastrichtian) of Alberta, Canada, 80-65 mya. It had a large brain and large eyes, and long, slender legs.

Founded in the plains of North America, the Dromiceiomimus was the fastest dinosaur, running at speeds of up to 40-50 mph. It was an omnivore with a basic diet of insects and vegetation, and occasionally would eat small rodents or lizards. Dromiceiomimus means Emu Mimic.


The type species, D. brevitertius was originally described as a species of Struthiomimus by William Parks in 1926 on the basis of a partial postcranium, ROM 797, from the Horseshoe Canyon Formation of Alberta, Canada.

In his review of Canadian ornithomimids, Dale Russell made S. brevitertius the type species of a new genus, Dromiceiomimus, meaning "Emu mimic" from the old generic name for the emu, Dromiceius. Russell also synonymized Struthiomimus ingens with Dromiceimimus brevitertius. He renamed Ornithomimus samueli into a second Dromiceiomimus species: Dromiceiomimus samueli Dromiceiomimus was distinguished from Ornithomimus edmontonicus on the basis of the following characters: humerus shorter than scapula; ulna ~70% of femoral length; preacetabular process, tibia, metatarsus and pedal digit III longer compared to femur.

In a 1981 publication, however, Nicholls an Russell cast doubt on the validity of Dromiceiomimus and treated it as synonymous with Ornithomimus, arguing that the limb proportions might be insufficient to distinguish it from Ornithomimus. In the second edition of the Dinosauria, Makovicky et al. claimed that there is no statistical support for the distinction of Dromiceiomimus from Ornithomimus and synonymized it with Ornithomimus edmontonicus.

However, a few authors continued to treat Dromiceiomimus as valid, and Longrich (2008, 2014) treated ROM 840 (holotype of Struthiomimus samueli) as a distinct species of ornithomimid related to Ornithomimus.