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The size, shape and structure of an eggcase, otherwise known as eggcase morphology, is a useful consideration when identifying an eggcase.
To more easily and accurately identify your eggcase it is helpful to first rehydrate it, by soaking it in water, so that it returns to its original shape. Find out how by visiting the prepare your eggcase page. There are many different types of eggcases that can be found on UK beaches:
Skate and ray eggcases can be identified by a ‘horn’ at each corner.
Catshark (otherwise known as 'dogfish') eggcases can be identified by their long, curly tendrils at both ends (if intact) – it is quite common to find several eggcases tangled together, or tangled with seaweed.
Eggcase size is a quick way of discounting the eggcases you have not got.
When you have reduced the number of choices, read the key identification points for your remaining species to determine which eggcase(s) you have. Use the individual characteristics for each species listed on the ID pages to make a definitive identification.
If you have any difficulties identifying your eggcase then take a look at our identification troubleshooter.
When you have identified your eggcase(s) you can let us know what you have found and submit pictures of your eggcases and you hunting for them, using our online recording form.
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