Oohkotokia is closely related to Euoplocephalus and Dyoplosaurus. A recent study about Oohkotokia proves that the fragmented remains of Oohkotokia were a specimen, or species of an obscure genus of ankylosaur, Scolosaurus.

According to Penkalski in the year 2013 the genus were assigned to Ankylosaurinae based on the features present in the Skull and based on the body of Oohkotokia. As per the study there were enough Morphological proofs that Oohkotokia are quite different from their relatives. Their relatives are named as Euoplocephalus tutus, Dyoplosaurus acutosquameus, and Scolosaurus.

Arbour and Currie in the year 2013 concluded the fact that Oohkotokia are the junior species of Scolosaurus. The Oohkotokia's body consists of a Skull which is measured 375 MM with an axial material. As per the study it is found that Oohkotokia are 6 metres long in size almost 19.7 ft in height and it is weighted almost 2 tons.

The Skull of Oohkotokia is similar to that of the skull of Euoplocephalus. The Skull has a very smooth texture when compared to ankylosaurid. It also has a partial Shoulder Blade bone and it has a thin-walled bony deposit which is very large & humerus. Penkalski has distinguished the features of Oohkotokia in his recent study stating that on the rear side of the skull the squamosal bones (a bone of the head of higher vertebrates) are found which seems to be horn like. The Squamosal bone has a keel which is flat in shape on the front side.

The eye socket is large in shape. The tail of Oohkotokia has a bone forming a "club"at the end of its tail which is made of two large bones. The presence of this kind of tail Club distinguishes Oohkotokia from its relatives. The tail has several layers of soft bones covered soft tissues. The strong tail of Oohkotokia helps to manage thousands of pounds of force. Oohkotokia uses its tail as a self-defense at the time of danger by swinging its tail to defend from the rivals or during sexual selection. The Jaw bones on the cheeks are broad and smooth with a strong curve line. There is a round projection that is present in the bottom of the Skull which is almost 16% small. Oohkotokia can be further classified as Chordata, Reptilia, Dinosauria, Ornithischia, Thyreophora, Ankylosauria, Ankylosauridae, Ankylosaurina.

Oohkotokia facts: