Flat Periwinkle

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.

3 thoughts on “Flat Periwinkle

  1. 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.)

    Liked by 1 person

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