| Peytoia infercambriensis Temporal range:
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| Interpretive drawing of holotype specimen of P. infercambriensis | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Order: | †Radiodonta |
| Family: | †Hurdiidae |
| Genus: | †Peytoia |
| Species: | †P. infercambriensis
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| Binomial name | |
| †Peytoia infercambriensis (Lendzion, 1975)
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| Synonyms | |
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Peytoia infercambriensis is a species of hurdiid radiodont in the genus Peytoia.
P. infercambriensis is the geologically oldest known radiodont; its remains date to the third age of the Cambrian. The type and only known specimen, a partial appendage, was found in a core sample from a borehole nearly five kilometers deep in northern Poland. P. infercambriensis was previously regarded as belonging to a separate genus, Cassubia, named after the historical region of Kashubia in which the specimen was found, but Cassubia is now considered a junior synonym of Peytoia.