What is mermaid purse?

A mermaid purse is the egg case of certain species of sharks, skates, and rays. It is usually elongated and rectangular in shape, with tendrils at each corner that help anchor it to the seafloor or other surfaces.

The mermaid purse serves as a protective casing for the developing embryo inside. The tendril-like extensions help prevent the egg case from being washed away by currents and provide camouflage on the ocean floor.

Each species of shark, skate, or ray has a unique egg case design that allows researchers to identify the species of the parent animal. Some mermaid purses are transparent, allowing observers to see the developing embryo inside.

Mermaid purses can often be found washed up on beaches, particularly after storms or high tides. They are often used by beachcombers and educators to teach about marine life and reproduction.