Showing posts with label banded wedge shell. Show all posts
Showing posts with label banded wedge shell. Show all posts

Monday, September 6, 2010

Beachcombing

There are few more pleasant ways to idle away an afternoon than to indulge in a spot of beachcombing, discovering what the falling tide has left behind, and when we arrived at Warkworth beach last Saturday lunchtime the tide had just turned, leaving a trail of marine artefacts, like the crimped pie-crust carapace of this edible crab .....

... and the saw-toothed carapace of a shore crab.

Recent rough seas had scoured the sand and cast up thousands of these sand mason worms, with their tubes constructed from grains of sand ....


... but this dog whelk, with its tough, thick shell may have been rolling around in the surf for weeks.

This is a mollusc that doesn't belong on the shore at all - it's a grove or brown-lipped snail Cepaea nemoralis, which is an air-breathing species that lives amongst the marram grass on the sand dunes behind the beach. Maybe a bird caught it and dropped it on the beach, or it might have been dislodged when a spring tide eroded the edge of the dune. This species comes in a variety of background colours and banding patterns, but many on the dunes here are either pure yellow or sometimes pink.

 
This is the delicate mauve interior of the rayed trough shell, which is decorated with markings ....


..... like the rays of the setting sun on its outer surface.


Banded wedge shells come in a range of colours, including brown and purple, but the pure yellow ones are particularly attractive.  

The star find was this tower or auger shell, Turritella communis. It's common enough around much of Britain, especially on the west coast, but this is the first time that I've found it here in thirty years of walking along this beach.


And finally, a modern archaeological curiosity - a clay pipe. I wonder who lost this, and how long ago - maybe a fisherman who dropped it overboard? Whoever it belonged to, it must have remained buried in the sand until a convergence of rough weather and high tide scoured it out and left it on the tide line.

For more beachcombing on Warkworth beach, visit

Saturday, June 20, 2009

Beachcombing 1.





We've just returned from a walk along Warkworth beach in Northumberland with our pockets full of seashells, but sadly they never look quite so good when you bring them home and they dry out, quickly losing the lustre that they had when they were wet. Fortunately I took a few photos of them in situ, as a reminder of their true beauty. Star find was the painted topshell Calliostoma zizyphinum (top two photos), with exquisite colours and a shape that shows how it came by its common name – just like an child’s old-fashioned spinning top. We’ve been walking along this beach for a quarter of a century and in all that time have found less than a dozen of these, so it was nice to see it again. This mollusc feeds in deep water in the sub-tidal zone, so to see the living animal you’d need luck and a very low spring tide - unless you're a diver. The next two photos show two colour forms of the very common but nonetheless delightful banded wedge shell Donax vittatus. This is often one of the commonest bivalve shells on this beach and after storms live specimens, that normally live buried below the sand surface within and below the intertidal zone, are often washed out of the sand. And finally – and this is a tentative identification – a banded venus Clausinella fasciata, about as large as a thumbnail with exquisite purple markings. If anyone can confirm this ID, or knows its certain identity, I’d be grateful for advice.