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Euoplocephalus was about 20 feet (6 meters) long and probably weighed about 2 tons.
Euoplocephalus was protected from carnivores by its armor which included oval plates embedded its skin, spikes, horns and a club-like tail. It even had armored shutters which could slide down to cover its eyelids. Appropriately enough, its name, Euoplocephalus, means "well-armored head", although it is also sometimes known as "Scolosaurus" (which means "spiny lizard").
Euoplocephalus was discovered by Lawrence Lambe in 1902, who proposed the name "Stereocephalus". However as this name "Stereocephalus" was already being used for an insect, the name of the dinosaur was changed to Euoplocephalus in 1910.
Fossils from around 40 different individuals have been discovered to date, including 15 skulls and one nearly complete skeleton.
Two species of Euoplocephalus are now known: the original species is now known as Euoplocephalus tutus, and a second species which was discovered in 1924 by William Arthur Parks, is now known as Euoplocephalus acutosquameus (the latter was once known as Dyoplosaurus). The species have different shaped clubs in their tails, but despite this, some scientists believe they are in fact a single species. Additionally, some other Ankylosaurids were once classified as being a Euoplocephalus species, but are now classified seperately.
Euoplocephalus (Scolosaurus) was a herbivore (plant-eater) that lived from 70 to 65 million years ago
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