Named By: Rinchen Barsbold - 1988.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Theropoda, Ornithomimidae.
Species: A. planinychus (type).
Diet: Uncertain but possible omnivore.
Size: Estimated at 3 meters long.
Known locations: Mongolia, Bayankhongor Province - Nemegt Formation.
Time period: Early Maastrichtian of the Cretaceous.
Fossil representation: Articulated skeleton, but skull and mandible (lower jaw) are unknown.
estimated length of around three meters long Anserimimus
the smaller end of the scale in terms of ornithomimosaur
related dinosaurs from the same area such as Gallimius
would have been
at least double this size, while the very incomplete Deinocheirus
would have been even larger than this. It’s most likely that these
variations in total size were down to each genus taking up a different
position in the ecosystem, growing to sizes that allowed them to best
fit their roles.
Anserimimus is most different to other ornithomimids by the structure of the arms which are powerfully built with almost straight claws that are only slightly curved growing from the fingers. The actual hand bones themselves were fused which resulted in the hand being stiffened to maintain its shape. It would seem that this hand and arm structure evolved for a very practical and physical purpose given the much stronger development, but how and why this worked is still unknown for certain.
(with new discoveries this list is likely to change)
Archaeornithomimus (Ancient bird mimic)
Beishanlong (Beishan/White mountains dragon)
Deinocheirus (Terrible hand)
Gallimimus (Chicken mimic)
Garudimimus (Garuda mimic)
Harpymimus (Harpy mimic)
Kinnareemimus (Kinnaree mimic)
Ornithomimus (Bird mimic)
Pelecanimimus (Pelican mimic)
Qiupalong (Qiupa dragon)
Shenzhousaurus (Shenzhous lizard)
Sinornithomimus (Chinese bird mimic)
Struthiomimus (Ostrich mimic)
- A new Late Cretaceous ornithomimid from the Mongolian People's Republic. - Paleontological Journal 1988(1):122-125. - R. Barsbold - 1988.