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Wikipedia definition
1. TetraceratopsTetraceratops insignis ("Four-horned face emblem") was a lizard-like synapsid. It lived during the Early Permian period. According to a recent, controversial report, T. insignis is the first known therapsid. Other scientists, on the other hand, say that it is a more primitive species of synapsid, possibly an unusual, lizard-like pelycosaur, as originally thought.
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