| Cumnoria Temporal range: Kimmeridgian
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| Holotype skeleton, Oxford University Museum of Natural History | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Neornithischia |
| Clade: | †Ornithopoda |
| Genus: | †Cumnoria Seeley, 1888 |
| Species: | †C. prestwichii
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| Binomial name | |
| †Cumnoria prestwichii Hulke, 1880
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| Synonyms | |
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Cumnoria is a genus of herbivorous iguanodontian dinosaur. It was a basal iguanodontian that lived during the Late Jurassic period (Kimmeridgian age) in what is now Oxfordshire, United Kingdom.