Named By: Andrew T. McDonald, James I. Kirkland, Donald D. DeBlieux, Scott K. Madsen, Jennifer Cavin, Andrew R. C. Milner & Lukas Panzarin - 2010.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Ornithopoda, Iguanodontia.
Species: I. fortis (type).
Size: Roughly estimated around 9 to 10 meters long.
Known locations: USA - Utah - Cedar Mountain Formation.
Time period: Barremian of the Cretaceous.
Fossil representation: Partial skull and post cranial remains.
Iguanacolossus acquired its name from its similarity to another dinosaur named Iguanodon. Although Iguanacolossus might not actually have been any bigger than the largest examples of Iguanodon, it might still have been the largest ornithopod plant eating dinosaur alive in North America at this stage of the Cretaceous, with the only plant eaters larger than this being the sauropods.
New Basal Iguanodonts from the Cedar Mountain Formation of Utah and the Evolution of Thumb-Spiked Dinosaurs - PLoS One 5(11):e14075:1-35 - A. T. McDonald, J. I. Kirkland, D. D. DeBlieux, S. K. Madsen, J. Cavin, A. R. C. Milner & L. Panzarin - 2010.