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derbyshiredowser

Beach find



Found this on the beach at Porthmadog last week and wondered what it was ,can't find it in any books , Thanks
sean

Some sort of sea urchin?
Hairyloon

Some sort of sea urchin?

Yup.
Sand dollar? Or sea potato?

ETA: https://en.wikipedia.org/wiki/Echinocardium_cordatum
buzzy

Yup again.

Picture of its brother here:

www.naturamediterraneo.com/Public/data6/IvanMulero/Echinocardium-cordatum-T.jpg_20071013132327_Echinocardium-cordatum-T.jpg

Henry
derbyshiredowser

Some sort of sea urchin?

Yup.
Sand dollar? Or sea potato?

ETA: https://en.wikipedia.org/wiki/Echinocardium_cordatum

Thanks for that, yes that's definitely it, interesting article and quite long living creature.
Mistress Rose

I have always known them as sea urchin shells, but never seen a live one that could be identified as being from one. I have a little one I picked up on a beach in Devon. sean

Sea urchins sah, thasands of them... dpack

iirc they live n die as a collective so i spose if any wash up it is often many in one go.

if it has been calm for a while any dead ones will get stirred up at the same time.

ages ago i saw a bunch of freshish ( not very fresh puke_r ) ones that still had some spines and contents after a storm and tide had swirled em out of the sand onto the beach.

as soon as you go below lowest low tide there are a huge variety of odd beasties, sea squirts have ace comedy value if one's chums have never been handed one before, especially when the single cavity two holes thing is explained,
there is a high probability that our gt gt ( to the power N where N is a very big number ) grannie was a sea squirt of some sort.
iirc tunicates are first in the fossil record for anything resembling a gut with two ends
Hairyloon

there is a high probability that our gt gt ( to the power N where N is a very big number ) grannie was a sea squirt of some sort.
iirc tunicates are first in the fossil record for anything resembling a gut with two ends
I think the more relevant feature is the beginnings of a backbone.
dpack

the gut evolved long before chordata.

tunicates predate worms, molluscs etc etc and seem to be a direct ancestor of all tubes.
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