| Tuzoia Temporal range:
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|---|---|
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| Carapace of Tuzoia retifera | |
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| Life restoration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Order: | †Hymenocarina |
| Family: | †Tuzoiidae |
| Genus: | †Tuzoia Walcott, 1912 |
| Type species | |
| Tuzoia retifera Walcott, 1912
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| Species | |
Tuzoia (from Mount Tuzo, a mountain in the Canadian Rockies) is an extinct genus of large bivalved arthropod known from Early to Middle Cambrian marine environments from what is now North America, Australia, China, Europe and Siberia. The large, domed carapace reached lengths of 180 millimetres (7.1 in), making them amongst the largest known Cambrian arthropods.