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These are called Water Hoglouse in some books - Asellus aquaticus. Not sure if there are any similar related species, does anyone know?
Entomologist and biological recorder
Thank you, it's a good description of it.
There are two species found in Britain, the commoner Asellus aquaticus and Asellus meridianus. They are easy to tell apart; A. aquaticus has two whiteish spots on the head and A. meridianus has only one white spot. Unfortunately, your photo is not clear enough to identify which it is, however, next time you catch one look for the number of spots on its head.
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Thank you. I didn't know that, next time I will check.
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