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| Ivantosaurus Temporal range: Wordian,
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| Genus: | †Ivantosaurus Tchudinov, 1983
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| Type species | |
| †Ivantosaurus ensifer Tchudinov, 1983
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Ivantosaurus is an extinct genus of therapsid that lived in Russia during the Wordian stage of the Permian period, named in honor of paleontologist Ivan Antonovich Efremov.[1]