The rising tide is just reaching them.
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The dahlia anemone has a rough warty skin. The only species that can form a shiny blob like this when exposed is the beadlet anemone, which is also far more common than the dahlia.
Thanks for the detailed notes pointing to this being a Beadlet. Could someone look back to my earlier (Mar 29) posting of an anenome with tentacles open~i.d. =dahlia. It seems to be on a sandy bed but, through the water, other points are not clear. Do I have both species down here?
I have already added the identification of dahlia anemone to this observation, I think on the same day it was posted.
Lat/Lng: 50.8267, -0.245
OS grid ref: TQ237044
Colonising the concrete sea defence structures.