Littorina obtusata
The colour of the shell of this small snail varies depending on its habitat, and it can be green, orange, yellow, brown or black. There are also banded and chequered patterned forms. The head tentacles of the animal have two lines along them. The shell is finely reticulate. Shell height up to 1.5cm.
Found on the middle to lower shower on large brown seaweeds such as Egg Wrack (Ascophyllum nodosum) and Toothed Wrack (Fucus serratus) on which it feeds. Common on widespread throughout.
Photographs taken August 2015, rockpool, Meadfoot Beach, Torquay, Devon.
Nature Journeys 
The yellow is gorgeous. Any idea why the colour change? (In other words, if you moved the yellow ones to another habitat, would their colour eventually change? Tho’ in asking that question I guess not … the shell is hard and fixed.)
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Thank you Sally. I am not entirely sure, but I presume due to camouflage purposes. I had never noticed these snails before then, and it is always exciting to discover something new 🙂
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Duh. Of course.
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