Gryphaea arcuata

Gryphaea arcuata is an extinct species of foam oyster, a bivalve mollusc in the family Gryphaeidae from the Early Jurassic of Europe.

Gryphaea arcuata
Temporal range: Hettangian–Bajocian
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Ostreida
Family: Gryphaeidae
Genus: Gryphaea
Species:
G. arcuata
Binomial name
Gryphaea arcuata
Lamarck, 1801

It is commonly referred to in English folklore as the 'devils toenail' due to its supposed resemblance to the devil's 'cloven hoof'.

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