Named By: Tony DiCroce & Kenneth Carpenter - 2001.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Ornithopoda, Iguanodontia, Ankylopollexia.
Species: P. venenica (type).
Size: Estimated about 6 meters long.
Known locations: USA, South Dakota, Utah - Cedar Mountain Formation, Poison Strip Sandstone.
Time period: Barremian of the Cretaceous.
Fossil representation: Remains of several individuals.
medium sized iguanodontid, dinosaur from the early Cretaceous of the
USA, Planicoxa is established upon the partial
remains of several
individuals. As an iguanodontid, Planicoxa
would have been a
primarily quadrupedal dinosaur, though one with the capability to
rear up and walk on just its hind legs when it needed to. Planicoxa
would have also likely had a hardened keratinous beak to the front of
its mouth so that it could easily crop mouthfuls of vegetation from
plants. A second species of Planicoxa created
from fossils previously
assigned to Camptosaurus
and named P. depressa, has now been
removed and used to establish the genus Osmakasaurus
Hailing from the Cedar Mountain Formation, Planicoxa may have been hunted by the larger predators of the time like Utahraptor and the huge Acrocanthosaurus. Smaller predators such as Deinonychus may have also posed a threat, especially if some of the theories about pack hunting dinosaurs are correct.
- A new ornithopod from the Cedar Mountain Formation (Lower Cretaceous) of eastern Utah, Tony DiCroce & Kenneth Carpenter - 2001.