| Marshosaurus Temporal range: Late Jurassic,
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| Skull cast | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Family: | †Piatnitzkysauridae |
| Genus: | †Marshosaurus Madsen, 1976[1] |
| Species: | †M. bicentesimus
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| Binomial name | |
| †Marshosaurus bicentesimus Madsen, 1976[1]
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Marshosaurus is a genus of medium-sized carnivorous theropod dinosaur, belonging to the family Piatnitzkysauridae, from the Late Jurassic Morrison Formation of Utah and possibly Colorado.