mermaid's purse

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mermaid's purse:

see rayray,
extremely flat-bodied cartilaginous marine fish, related to the shark. The pectoral fins of most rays are developed into broad, flat, winglike appendages, attached all along the sides of the head; the animal swims by rippling movements of these wings.
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References in periodicals archive ?
The hunt for eggcases, which are sometimes referred to as mermaid's purses, was organised in response to the decline in skate and ray found in UK waters.
Therewill also be the chance to viewa 'shark nursery' - home to egg-cases, or mermaid's purses, and newly-hatched baby sharks.