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Mesosaurus is also known today as the middle lizard is an endangered genus of reptile from the early Permian of Southern Africa and South America. This reptile is believed to be one of the first marine reptiles. The fossils of these reptiles suggests that the continents South America, Africa and Antarctica were once a big supercontinent named Pangaea. However, due to some plate movements as mentioned in the theory of the continental drift, this one big continent started to break thus creating individual continents like South America and others. The scenario suggests that a long time ago, there was no South America, Africa and Antarctica because there was only one supercontinent. 
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It tells that south america and africa are together and also to the antartica and the ancient climate of the antartica is tropical.