dejayM's picture

Rough periwinkle

Observed: 18th April 2013 By: dejayM
Biological Recording In ScotlandHighland Biological Recording GroupOrkney Biodiversity Records Centre
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banded
unicolour
trailing
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Description:

Seems to come (here locally) in very drab forms but the one seen here is banded.
The smooth one is the Common Periwinkle (for comparison)
See Comment

Identifications
Species interactions

No interactions present.

Comments

dejayM's picture

doubts

This post originates here -
http://www.ispot.org.uk/node/323003
where, quite correctly, I was put right in the comments.
I still have some doubts about these being L. saxatillis, so I am awaiting comment and a very low tide later this week!
The 'tracks' are interesting. Made in very wet sand on top of the drying stone as winkles and whelks made their dash for lairs. See here
http://www.ispot.org.uk/node/322854

gramandy's picture

Hi Derek ...

...would really help to get opening stats, angle of opening to spire, how large in comparison to whorls, pinpoints better the sp. I think you are probably right though (saxatilis not saxatilia).

I know not nice to disturb but for ID sometimes necessary. I have done this and put them back where they were, watched for 10 mins and they scuttled off (extremely slowly) to where they wanted to be.

dejayM's picture

ratios

Years ago, I spent a week, an hour a day, measuring height-to-opening ratio on Dog Whelks. I was on an Island and often fell asleep in the breezes! Happy daze.
Browsing my recent pictures, I see far more L.saxatilis than I'd thought.
Yes though, a good idea. THANKS Graham
Fairly big tides here end of week...
http://easytide.ukho.gov.uk/Easytide/EasyTide/SelectPort.aspx