Gyphaea arcuata (Devil's Toe Nail), from Lyme Regis, England (No.102)

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Gyphaea arcuata (Devil's Toe Nail), from Lyme Regis, England (No.102)Gyphaea Arcuata (Devil's Toe Nail), from Lyme Regis, England
190 Million Years, Lower Jurassic

Measurements Approx.
Height - 9.8 cm
Width - 11.1 cm
Length - 12.5 cm



Gryphaea were among the first true oysters and one of the best known fossil bivalves, appearing in the Triassic Period to the Late Jurassic.

The concave right valve fits like a lid within the larger left valve, which has a narrow, in-rolled beak. Internally, the single muscle scar is circular; the adult hinge has no teeth.

Gryphaea lived on muddy seas beds, originally cemented to a small particle of rock by its tip.

The name Devil’s Toe Nail is considered to be derived from Victorian folklore. Victorian fascination with the occult left the Gryphaea with what some might call an un-wanted or unjust nick name because of its strange looks.

   





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