| Oxytoma Temporal range: Early Jurassic |
|
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Pterioidea |
| Superfamily: | Ostreoidea |
| Family: | Gryphaeidae |
| Genus: | Gryphaea |
| Species: | G. arcuata |
Gryphaea arcuata is an extinct species of bivalve mollusk 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'.