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I found this on a uk north west beach today but have no idea what it is. Any help? :)
I really wish this was a Giant Isopod but it is actually the tail of a crab. The part that comes from the back of the shell and is folded between the legs.
I agree with Lewis, it is the tail of a crab, a female crab at that. The male tails are much narrower and more pointed see http://en.wikipedia.org/wiki/File:Pachygrapsus_marmoratus_male_female.png on http://en.wikipedia.org/wiki/Crab The fine leg-like structures on the underside in image 9 are used to hold the egg mass in place pre-release & fertilization.
I wouldn't like to hazard a guess as to which species of crab though!
I think it looks like a fossil of a giant woodlouse.