Figure 8.

Back and opercular view of shells of the lower-shore Su (left) and upper shore Rb (right) morphs of Littorina saxatilis form the Galician coasts. The seven measures used are shown on the Su shell. Note: Rb snails are on average larger than Sus; shells of similar sizes were chosen to ease comparison on the image.

Garcia BMC Evolutionary Biology 2012 12:222   doi:10.1186/1471-2148-12-222
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