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The egg case of the flapper skate (Dipturus batis), also called the blue skate or the gray skate, is enormous compared to that of the thornback ray (Raja clavata). It measures 29 by 12,5 centimeters!
An egg case colloquially known as a mermaid's purse is a casing that surrounds the fertilized eggs of some sharks, skates, and chimaeras. They are made of collagen protein strands.
Photo: ecomare
