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Pareiasaur
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The Pareiasaurs - family Pareiasauridae - are a group of medium-sized to large herbivorous anapsid reptiles that flourished during the Permian period. Sizes of known Pareiasaurs was from 60 cm to 3 meters long. Their build was quite stocky, often with rather short tails and small heads. These ungainly-looking animals had very large bodies (weights of 600 kg would not have been unusual), strong limbs, broad feet, and short tails.

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Encyclopedia
The Pareiasaurs - family Pareiasauridae - are a group of medium-sized to large herbivorous anapsid reptiles that flourished during the Permian period. Sizes of known Pareiasaurs was from 60 cm to 3 meters long. Their build was quite stocky, often with rather short tails and small heads. These ungainly-looking animals had very large bodies (weights of 600 kg would not have been unusual), strong limbs, broad feet, and short tails. They were protected with bony scutes (osteoderms) set in the skin, as a defense against predators. But the most unusual thing about them were the heavy skulls ornamented with strange knobs and ridges.
The leaf-shaped multi-cusped teeth resemble those of iguanas, caseids, and other reptilian herbivores. This dentition, together with the deep capacious body (which would have housed an extensive digestive tract) indicate that these fearsome-looking animals were herbivores.
Lee (1997) has argued that Pareiasaurs evolved into turtles. They had turtle-like skull features, and in several genera the scutes had developed into bony plates, possibly the precursors of a turtle shell. However, critics have pointed out problems in this view, such as the non-homology between pareiasaur scutes and the turtle shell.
In fiction
In Edgar Rice Burroughs' novel Tarzan at the Earth's Core, the characters encounter Pareiasaurs in Pellucidar. They are called Gorobors by the native Pellucidarians. In the book they are portrayed as the fastest of all animals.
The British ITV show Primeval shows pareiasaurs in several episodes, though these pareiasaurs are shown being the size of elephants, much larger than the actual creature.
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