| Alligatorium Temporal range: Kimmeridgian-early Tithonian,
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| A. meyeri fossil | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Archosauria |
| Clade: | Pseudosuchia |
| Clade: | Crocodylomorpha |
| Clade: | Crocodyliformes |
| Family: | †Atoposauridae |
| Genus: | †Alligatorium Gervais, 1871 |
| Species | |
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Alligatorium is an extinct genus of atoposaurid crocodylomorph from Late Jurassic marine deposits in France.