Priconodon

Priconodon crassus was a low-built, heavily armored plant-eating dinosaur belonging to a group called nodosaurs. Nodosaurs had bony armor and spikes on their back, legs, and tail, but they did not have clubbed tails like the related Ankylosaurus. Although Priconodon is only known from teeth, scientists are confident that this species was a nodosaur because its teeth share the same distinctive shape as teeth found in the skulls of more complete nodosaurs found elsewhere.
Priconodon Fossils