Gryphaea arcuata
| Gryphaea arcuata Temporal range:
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Ostreida |
| Family: | Gryphaeidae |
| Genus: | †Gryphaea |
| Species: | †G. arcuata
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| Binomial name | |
| †Gryphaea arcuata Lamarck, 1801
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Gryphaea arcuata is an extinct species of foam oyster, a bivalve mollusc in the family Gryphaeidae from the Early Jurassic of Europe.
It is commonly referred to in English folklore as the 'devils toenail' due to its supposed resemblance to the devil's 'cloven hoof'.
Sources
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- Gryphaea arcuata Archived 2012-03-13 at the Wayback Machine in the Paleobiology Database
- Fossils (Smithsonian Handbooks) by David Ward (Page 101)
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