Regisaurus
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| Skull cast seen from below, Museum of Evolution of Polish Academy of Sciences, Warsaw | |
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| Genus: | Regisaurus |
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Regisaurus ("Rex's lizard", named after Francis Rex Parrington) is an extinct genus of small carnivorous therocephalian. It is known from a single described species, the type species Regisaurus jacobi, from the Early Triassic Lystrosaurus Assemblage Zone of South Africa, although at least one undescribed species is also known.