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100s of these washed up on beach near Aberffraw after recent gales - have found a better but un-named image on the web - what are they? Pink, maggot-like between 10-20cm.
They are sea cucumbers.
Your photo is on this page
where it is named as such.
From comments a bit further up that page, it appears they could be Thyone fusus.
The body is usually buried in the sediment, leaving just the tentacles showing
Thanks Mike! Looking at the link the other examples are from other local beaches so I'm sure it's correct.