Named By: M. K. Brett-Surman - 1979.
Synonyms: Mandschurosaurus mongoliensis.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Ornithopoda, Hadrosauroidea.
Species: G. mongoliensis (type), G. atavus, G. arkhangelskyi.
Size: Up to about 6 meters long.
Known locations: Mongolia - Iren Dabasu Formation. Uzbekistan - Khodzhakul Formation, Bissekty Formation.
Time period: Campanian of the Cretaceous.
Fossil representation: Remains of several individuals.
discovery of Gilmoreosaurus began in 1923 when
the first fossil
remains were discovered. These remains were however referred to the
as a new species, which is where they
remained until a study by Brett-Surman in 1979 saw them
re-identified as a distinct genus separate from Mandschurosaurus.
Later in 1995, two further species of Gilmoreosaurus
from fossils discovered in Uzbekistan. The Uzbekistani species (G.
atavus and G. arkhangelskyi) however are not
always considered as
belonging to Gilmoreosaurus upon the basis that
they are based upon
only fragmentary remains. Further discoveries in the future may be
able to clarify. Fossils of another species G.
now usually included into the Bactrosaurus
Gilmoreosaurus was a mid-sized hadrosauroid dinosaur, the kind that was very similar to hadrosaurid dinosaurs though not quite one, being slightly more primitive. Though more primitive however, Gilmoreosaurus still lived at the same time as the more advanced hadrosaurids, showing us the more primitive forms were not immediately displaced by their more developed descendants.
At about six meters in length, Gilmoreosaurus was a medium sized hadrosauroid, and one that may have been preyed upon by large tyrannosaurs such as Alioramus and Tarbosaurus.
- Phylogeny and palaeobiogeography of hadrosaurian dinosaurs. - Nature 277:560-562 0 - M. K. Brett-Surman - 1979.
- Anatomy and Relationships of Gilmoreosaurus mongoliensis (Dinosauria: Hadrosauroidea) from the Late Cretaceous of Central Asia. - American Museum Novitates 3694: 1-49. - A. Prieto-Márquez & M.A. Norell - 2010.