Named By: Paul Penkalski - 2013.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Thyreophora, Ankylosauria, Ankylosauridae, Ankylosaurinae.
Species: O. horneri (type).
Size: Estimated up to 6 meters long.
Known locations: USA, Montana - Two Medicine Formation.
Time period: Campanian of the Cretaceous.
Fossil representation: Skull and partial post cranial skeleton.
was a medium to large ankylosaurid
dinosaur that is so far only known
from a single individual, though other fossils gathered in the past
may actually represent specimens of this genus. Oohkotokia
have been similar to Euoplocephalus,
though is considered distinct
because the skull texture of Oohkotokia is quite
smooth in comparison
to other ankylosaurid genera. Like with its ankylosaurid brethren,
Oohkotokia would have been protected by a covering
of heavy bony
armour all across its back and sides, with a heavy bony club on the
end of its tail. These were necessary defensive adaptations when you
consider that the habitat that Oohkotokia is known
from was also the
home for large tyrannosaurs
such as Daspletosaurus
Oohkotokia is believed to have lived in a semi-arid environment which experienced seasonal rainfalls that probably triggered the growth of lush seasonal blooms of plants. Aside from Oohkotokia, other herbivores in this location include the nodosaur Edmontonia, the ceratopsians Einiosaurus, Achelousaurus and Brachyceratops, and the hadrosaurids Hypacrosaurus, Maiasaura and Prosaurolophus. In addition to these and the aforementioned tyrannosaurs, other theropods in the area included troodonts, dromaeosaurs and oviraptosaurs.
The name Oohkotokia is from the Blackfoot for ‘large stone’, while the species name, O. horneri is in honour of palaeontologist John R. Horner.
- A new ankylosaurid from the late Cretaceous Two Medicine Formation of Montana, USA, Paul Penkalski - 2013.