Low Ri's picture

P1030516

Observed: 24th January 2011 By: Low Ri
P1030516
P1030746
Description:

2.4cm length x 2cm width. Small solid blue and white bivalve with obvious concentric ridges / growth lines. Discovered on a sandy beach on east coast of Anglesey.

Identifications
Species interactions

No interactions present.

Comments

BeckyWhitworth's picture

Good photo.It is likely to be

Good photo.It is likely to be a thick trough shell. According to my pocket book though the living versions of the shell can be found buried under the sand.

not sure if i have posted this right

Becky Whitworth

Mike Kendall's picture

Name change and other comments

The taxonomists struck some time ago and Venus striatula is now Chamelea gallina. From this picture I can't be certain that this is the correct species name but i think its probably right. I don't think its Spisula.

It would have been easier to identify if the picture had been taken from directly above and if a second picture had been taken of the teeth on the hinge line.

Mike Kendall

Peter Skelton's picture

bivalve

The ornamentation looks rather too strong for Spisula solida, and I think it's more likely to be a venerid. The matter could be quite quickly solved if we could have an internal view showing the hinge margin. Spisula would have the typical mactracean indented triangular 'chondrophore' for the internal ligament in the middle of the hinge plate, while Venus would not (having only an external ligament). Nice pictures, though - thanks!
Peter

Peter Skelton's picture

bivalve dentition

Many thanks for posting the new internal view. Definitely 'corbiculoid' dentition, with three cardinal teeth and no internal chondrophore. So we can say it's definitely a venerid and not Spisula (which would have a chondrophore). I was unaware of the name change mentioned for this species by Mike, so thanks for that, too.

Peter

dejayM's picture

getting out

Speaking of chondrophores, as you do, see one clearly here http://www.ispotnature.org/node/393843
Never heard of it before today!
Same applies to -
corbiculoid
mactracean
I must get out more often!
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