Violet Sea Snail

An hour of beach combing today at Praa Sands, chosen because it is a reasonably long beach facing the prevailing wind that day. A fair amount of Goose Barnacles smattered among the rocks. On the strand line, bits of seaweed and lots of plastic rope fragments from fishing boats (which were duly picked up). Not expecting anything spectacular, my eye was caught by a tiny bit of violet, which proved to be a Violet Sea Snail! We had only found a Janthina janthina once before in our ten years in Cornwall but that was an empty shell whereas this still had its bubble raft. Janthina floats at the surface on the open ocean under this raft and therefore is part of the ‘neuston’ (or ‘pleuston’). It is a predator of other such purple ocean surface dwellers such as By-The-Wind Sailors Velella velella, and the Portuguese Man o’ War, Physalia physalis. It was tiny, the shell measuring only a centimeter or so. There were many By-The-Wind Sailors too, and these were just as small or smaller (usually they are 4-8 centimeters or so). I did not use a flash (looks to artificial), keeping ISO at 200 and f/7.1 I had to go down to 1/30s for shutter speed which was doable leaning on the beach. The protoconch is nice and sharp when you zoom in.

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