| Lessemsaurus Temporal range: Norian
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Clade: | †Lessemsauridae |
| Genus: | †Lessemsaurus Bonaparte 1999 |
| Species: | †L. sauropoides
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| Binomial name | |
| †Lessemsaurus sauropoides Bonaparte 1999
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Lessemsaurus is an extinct genus of sauropodiform dinosaur belonging to Lessemsauridae.