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Beach find

 
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derbyshiredowser



Joined: 11 Feb 2007
Posts: 785
Location: derbyshire
PostPosted: Fri Jul 06, 18 10:05 am    Post subject: Beach find  Reply with quote    



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

sean
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 41910
Location: North Devon
PostPosted: Fri Jul 06, 18 11:06 am    Post subject: Reply with quote    

Some sort of sea urchin?

Hairyloon



Joined: 20 Nov 2008
Posts: 15051
Location: Today I are mostly being in Yorkshire.
PostPosted: Fri Jul 06, 18 11:30 am    Post subject: Reply with quote    

sean wrote:
Some sort of sea urchin?

Yup.
Sand dollar? Or sea potato?

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

buzzy



Joined: 04 Jan 2011
Posts: 3429
Location: In a small wood on the edge of the Huntingdonshire Wolds
PostPosted: Fri Jul 06, 18 12:00 pm    Post subject: Reply with quote    

Yup again.

Picture of its brother here:

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

Henry

derbyshiredowser



Joined: 11 Feb 2007
Posts: 785
Location: derbyshire
PostPosted: Fri Jul 06, 18 12:27 pm    Post subject: Reply with quote    

Hairyloon wrote:
sean wrote:
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



Joined: 21 Jul 2011
Posts: 10049

PostPosted: Sat Jul 07, 18 6:54 am    Post subject: Reply with quote    

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
Downsizer Moderator


Joined: 28 Oct 2004
Posts: 41910
Location: North Devon
PostPosted: Sat Aug 18, 18 3:06 pm    Post subject: Reply with quote    

Sea urchins sah, thasands of them...

dpack



Joined: 02 Jul 2005
Posts: 34297
Location: yes
PostPosted: Sat Aug 18, 18 10:20 pm    Post subject: Reply with quote    

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 ) 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



Joined: 20 Nov 2008
Posts: 15051
Location: Today I are mostly being in Yorkshire.
PostPosted: Sun Aug 19, 18 8:54 am    Post subject: Reply with quote    

dpack wrote:
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



Joined: 02 Jul 2005
Posts: 34297
Location: yes
PostPosted: Sun Aug 19, 18 11:12 am    Post subject: Reply with quote    

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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